I'm not sure this is the right place for this question, but...

Some of the SE sites I visit have domain names of the form [site].stackexchange.com and some [site].com.  Since I hardly ever use links and type a few chars in the URL bar to get to as site this sometimes tangles me up.

Does anyone else see any value in this or am I just too lazy and easily confused? :)

Edit: Changed angle brackets to square so they would show up.