We have stayed in the Garden Wing and I think it's a great deal considering the prices are usually on par with the Epcot area resorts which have smaller rooms. I've heard some people claim the walk to the tower is long and were even warned of this, but we found this claim to be grossly exaggerated. Maybe some people make the mistake of walking inside vs. taking the more direct paths outside? We were in the area along the water and it never took more than a few minutes to get to the ground floor of the tower and it's a super easy walk from that point to get over to the bus area.
At the risk of sounding ignorant on this subject , ( which I am ), am I correct in assuming the rack rate for a garden wing room is less than a tower room?
Beyond that, no you're not going to get the monorail going through the tower feeling and the views aren't as dramatic, but we could see the tower from our doors leading to our patio (we were on the inward facing side of the branch along the water)...so it always screamed Disney World to us when we looked outside. You will want to request a 1st floor room if you want a patio as there are no balconies on the second floors. Some people slam it for this, but how different is this from certain 2nd floor rooms at the Poly with no balcony?
The rooms themselves are identical to the tower, so you get all the same space, decor, etc. as you would in the tower. I also felt like the Garden Wing was a bit more quiet than staying in the tower. Some complain that the lower floors in the tower pick up a lot of noise from monorail and Chef Mickey's. I never noticed this, but there was just a lot more foot traffic coming and going in the tower that makes it a bit less peaceful IMO. Don't get me wrong...I like being in the tower and seeing all of the iconic Contemporary and Disney stuff, but there is something to be said for the peace of the GW.
It's also easier to get to the pool from the Garden Wing as well as the dock should you want to take the boat to WL and FT Wilderness. Oh, and Mousekeeping/service was the same...so no real difference there.
All in all, I'd stay in the Garden Wing again. I prefer the tower, but sometimes a stay in the Garden Wing could allow you to add an extra day or more signature meals, etc.