@hyperreal "Venturing outside one's comfort zone can be instructive, if only to make the return that much more comforting."
Trying other ways of doing things is good, if just to be exposed to new ideas. Once at work I forced myself to use Vim for a month (I allowed myself to still use Emacs at home). Get to actually be proficient with it, so I can have informed opinions about it.
Futzing with Acme has been informative about some interesting ideas that I want to bring back to Emacs.