Every group is different, with some hanging around one extreme more than others. It's beginning to sound to me like your fellow players just need to have a frank discussion about some things, because if I were there I'd be up front about my ZERO interest in player motivations and character development - as a player.
For the same reason I despise background stories on 1st level characters, I get annoyed with players think that THEIR plotline or THEIR character is interesting or important at all. Mind you again, I'm speaking from the perspective of a player, not a GM.
My characters are not interesting, they do not have motivations other than the mission (Which they will solve as they see fit), and if my characters die then I'll make another.
The DM tells the story, the players tell how their characters behave within the story. That's how the game works. I can't stand when someone wants to waste everyone else's time so THEIR character can satisfy THEIR fluff. MY fluff is that I do the job at hand and I work with other party members. I don't go off to a masquerade ball without them and I don't have complex rituals that I need to satisfy which don't involve them. Every second that I'm at that table I'm trying to make sure I'm not the only one in the spotlight, and any time I notice time increments larger than 1 round being spent on me I duck out from under it.
On another forum someone asked how to solve the problem of making characters with different motivations and alignments form a party in a believable way. Basically the person asking the question was having trouble understanding why player characters should hang out together at all. It's a good question, or it would be if you don't realize the correct answer is simple and WON'T be consistent with your PC's preference: "If you don't play together, we don't have a game."
Perhaps your players need to learn that what their characters want means jack shit, because they're just puppets for a bunch of D&D geeks? Railroading is taking control of the PCs away from the players so that you can force and outcome (This doesn't have to mean you take control of the PCs, it means you simply don't let the players control them. Example: the cut scene where your character stands aghast at something instead of taking action.). As long as the DM isn't doing that, then the players who like to shout "It's a Plot-Monster, RUN!" should shut their mouths and play the game. Not every plot is as good as the last one, some campaigns are written better than others.
If you want to avoid the plot, then you are deliberately alienating one player: The GM. Never forget that everyone at the table is playing the game, one in particular has just saddled a greater burden. The GM gets to decide what the world looks like and what's in it other than you, you only get to decide what YOU are doing in that world. It's not railroading, it's just the roles you play.