Yes, some, but not most. I switched from Subversion to Git myself a couple months ago and it took a week or two, but I learned "the git way" of doing things. Yes, I would need to look up the command to remove a remote branch, but I haven't done it in weeks and didn't commit it to memory the first time so that's understandable.

Building something people want doesn't really need to be a goal of open-source software. Most software is built in the first place to solve a need of the person or people building it. Since they're not getting paid, what do they care if everybody wants to use it? A large majority of people seem to like Git. There will always be those who do not and I'm sure everybody has something they dislike about it. The difference is, Git is not commercial software, so making it more usable need not be an overwhelming goal -- although, you could fork it and make it your goal.