I definitely type cp -i and mv -i by habit, and I have a ~/trash directory that I often move stuff into instead of deleting it and then periodically blow away completely. I agree with some other commenters that all the stuff in .bash_profile is maybe not a good idea, but I find that just doing those three things creates a lot more safety than just the "you said to remove it so now 5ms later it's gone forever" Unix default.