Love the DLH! Its a favorite of ours and for me personally, I prefer it over the GCH. I like the pool areas better and I like the oversized room and the fact that every room either gets a daybed or free rollaway. In seven stays (soon to be 8) in the past five years, we've always had a very nice room, that is clean. I love the grounds, the dining options and the general feel. The GCH is nice, but for me, I prefer the DLH and stick with that now. And I use points at the DLH and its so nice not to have to pay that daily resort fee or high So. Cal hotel tax!
A standard room in the Dreams Tower or Magic Tower would be closest to the pool. However, I actually prefer the Bonita (which I think is now called the Wonder) you can actually get a high up room facing the Koi Ponds. That is my favorite place to be, a bit further to the pool and parks (by very little really) but I love that location.
But to be the closest to the pool, you want either Dreams or Magic.