With Mercurial, I like that all commands can be abbreviated to their shortest unique prefix, plus some built-in aliases. So I type a lot of `hg up`, `hg pus`, `hg ci`, `hg pul`, `hg bo`, and so forth. Most of these are almost the same length as your aliases.

Whenever I have to touch git and `git co` doesn't work, I think, okay, fine, we'll go through the full dress rehearsal; `git checkout` it is.