I hear you. I never had any "real" issues with RVM other than I probably never really learned how to use it, so it kept tripping me up. (I'm not very good at this stuff..)
I was setting up a new computer a few months ago and decided to give rbenv a try and it hasn't given me any reason not to like it so far. Just guided someone on the west coast who has never worked with Ruby before through installing it and getting her first Rails project up and running last night, via approximately 65 emails. Does that make me an advocate?