problem is, it is (will be) my problem to fix. I don't want to be hero, but I will get assigned to those places to fix it up. Because it worked before, and managers were happy with my work before.
It really is a matter of not being able to say no and wanting to swoop in and save stuff. It's not good for you. Ultimately, it creates this terrible mentality at the workplace where you're expected by your manager to come in and save things all the time. This also means that your coworkers don't step up to learn more of the stack and troubleshoot, because they know that they will always have you to fall back on.
It might be easier to say no when you reframe things with this perspective. If you never say no, no one else will ever learn, and therefore you will ALWAYS be stuck in this position.
I've been called "programmer-whore" by friends (in joking manner :) ). Because I go in and fullfil wildest manager's dreams for money. Huh. Some truth to it I guess.
I hope that expression is not too vurglar to use here... sorry I'm not native English speaker.
If you're doing the work and not complaining managers will think you're happy. If you're working overtime to get this done they'll think you're very happy. If you aren't enjoying it you need to tell them. They aren't mind readers.