+1 in support of full size. Well...+0.5, let's say. I think it does depend on the user a lot.
There are definitely some real advantages to an attached number pad if you use it. Unlike a separate number pad, an attached number pad stays in exact alignment with your other keys when you reposition your keyboard, which some people do every time they shift position in their chair. There's also less wasted space when the number pad and keyboard are integrated, fewer wires, and fewer ports used. So, if you are a serious number pad user, a full size layout can still make sense.
For me, personally, before I got into mechanical keyboards, I spent many years using laptops without number pads. Basically I came into the game already having plenty of experience with not having a number pad, and knew that if I could possibly get the number pad back, that I wanted it. So I really don't have much interest in things that are smaller than full size. I don't even enter long lists of number that often (though I do have to do so occasionally), but between that, playing older games that benefit from or even require the number pad, and various general keyboarding habits that make use of the number pad for all sorts of random little purposes, I find that I really miss it when it's not there.
Of course, if you don't use it, then you might as well free up the extra space, especially if you are so unfortunate as to be using a mouse rather than a trackball as your primary pointing device. Hence +0.5 for the full-size: if your workflow and/or your habits call for the number pad, then a full-size keyboard is a good option. If they don't, then don't bother.
