I switch between different apps without any major pains, one thing I have noticed though is that I tend to use Cmd + x, c, v within MacVim anyway. Yes, I know

I switch between different apps without any major pains, one thing I have noticed though is that I tend to use Cmd + x, c, v within MacVim anyway. Yes, I know it is bad, but it lets me get work done quickly and efficiently and thus I really don't care what the purists say. Maybe that is the key to success, don't let the purists say that you shouldn't do it, just do what feels natural and eventually it will help you get faster anyway.