You used to be able to use the up arrow to select items, instead of hitting the Enter key. (Note that inside a menu, the arrows always move you around the menu options, both then and now.) Many of us got used to using this. In particular, I find it much more natural than hitting Enter. Some people using wasd for arrows apparently liked it a lot too.
This has now been (intentionally) disabled. I'm grumpy about it. Kevbob sent me to the forums to be grumpy. Here we are.