Yes, but people usually google before going to stack overflow compared to gbatemp, where people usually ask, then google
Well, people who use Stack Overflow are mostly developers, who are actually pretty smart with computers, so they always know that they should check if their questions had been asked before asking questions. Also, when you ask a question, there's a mini guideline next to it, and then there's up/downvote system, asking shit questions and you will be downvoted into oblivion. Pretty sure there's some mods going around checking if there's any duplicated questions.
GBATemp though, hahahahaha...I mean, creating a thread is just as easy as eating a cake, and people coming here are often "wheres mah hax, wheres mah pahrated game?!!11!!1 yahyah". Oh, and uh, well, they ask, but I don't think they google.
Of course, exceptions are there, but you get the idea.