A few brief comments before I get back to studying:
1) I think DMing is the way to spread the gospel. As DM you get a lot of autonomy, and won't run into the fairly common issue of having the combos and interesting things (classes, feats, etc.) you propose seeming threatening. You can also demonstrate important facts like that there's a way to do optimization w/out it becoming an arm's race between the PCs and the DM and that it's perfectly easy and, indeed, enjoyable to construct encounter/challenges for reasonably optimized PCs. As a DM/GM/whatever the kids are calling it these days I actually prefer pretty optimized PCs: then I don't feel bad about playing the elder demon as reasonably intelligent and using his cool abilities and combos or setting the encounter in an interesting funky environment, etc. -- all things that make DMing enjoyable to me.
2) A big question that's gone, I think undiscussed and is also in evidence in Takanaki's troubles, is what the point of optimization is. In part, it's just a fun aspect of the game -- it is a game after all. But, IMHO, the "real" point is that it lets you realize interesting characters who do whatever it is they're supposed to do well. D&D is a heroic game, and as heroes everyone should have at least a little bit of awesome, whether that's being the greatest swordsman ever (Lancelot), incorruptible (I can't quite recall, Percival maybe? Frodo), enduring (Boromir, Leonidas, any number of dwarves), a canny negotiator, inhumanly charming, or so forth. Whatever it is that you're cool fantasy character is supposed to do he or she should be pretty good at it.
Cast in that way, I can't see how anybody could have an issue w/ optimization. Maybe there are some people who don't want their character to be good at anything, and to that I am comfortable telling them that D&D is not the game for them (frankly, I don't know what game would be) -- it's a heroic genre, and you're supposed to be the heroes, broadly-defined. It'd be hard to imagine Star Wars or Indiana Jones being all that compelling if the protagonists had no talents or abilities going for them. I'm curious if people have tried to explain it that way, and whether it's succeeded. There's of course a limit to this, which I tend to view as a "gentleman's agreement:" I'm not going to ban polymorph, but I'm going to expect my players (and myself) to use some discretion and not subject me to persistent draconic polymorphed war trolls w/ greater invisibility -- at least w/out talking it over w/ me first.
Which, brings me to the main reason why I lurk on these boards (well, besides procrastinating), and a sincere thanks to all of you who post: the optimization tools that are put on these boards allow you to make a wider variety of unique and interesting characters. So, when a friend says "I'd like to play a soulknife," which is at least in concept a cool class, I can have a better option than just saying "no, you don't want to do that." We can either find a trick to make it viable, or find a class akin to it or to layer onto it (e.g., Kensai) to make the whole thing work. That, quite frankly, is wonderful. Other examples are making fighters really viable. It's nice to be able to give people real options when they don't want to play a wizard or CoDzilla.
Actually, now that I think about it, probably the real problem is that the rulebooks lie. Someone pages through the PHB and they find Monk or Ranger and they say "that's the kind of character I want to play." Then, you have to explain to them that the writers are liars, or that those classes aren't very well thought out -- I am more than happy to say "friends don't let friends play monks" -- and then to suggest different ways to realize those character concepts.
That's my rant. I'm blessed w/ a few consistent gaming groups w/ good friends, so we rarely disagree on these issues, and often seek each other's advice. Like, I'll ask "is this too powerful? What if I toned it down like this?" and stuff like that. I am curious how anyone could be annoyed w/ optimization when it's put that way. Maybe they take things like "rangers suck" personally? Beats me. The one time recently it did come up there was a person who seemed willfully against optimizing, even though he didn't say it. I didn't game w/ him for very long (for a number of reasons), but it just struck me as a disaster waiting to happen b/c he was going to have what he thought were neat abilities, but that would never work b/c of the way he had constructed them (this was M&M), which I expect would just lead to disappointment.