I use RVM and create .ruby-version files for every single project I touch. Occasionally I'll let more than one project share a Ruby version/Gemset combo, but of

I use RVM and create .ruby-version files for every single project I touch. Occasionally I'll let more than one project share a Ruby version/Gemset combo, but often I'll make sure each is unique. No need to "bundle exec" anymore, because simply cd'ing in and out of project folders resets your gems to a clean list only required by that app. It's great. The years come and go and I still hear people complaining about Ruby version and gem hell and I wonder why the heck they aren't using RVM!