[ecyrb]

Or you could use the Viper and Vimpulse packages to enable Vi style emulation in Emacs.

[honeycrisp]

Would I notice any differences? Does it still feel like vim?

[spacemanaki]

I tried this for a while and there were little things that drove me crazy. I can't remember the exact issues I had, but I'm sure other long time Vimmers would have some problems. I just found myself having to look up "why is this command xyz not doing what I expect in Viper mode" all the time. YMMV