I'll give some more info
We have only been to WDW once and we stayed off-site. So this time we really want the best Disney experience! I may look into the CR. We will be doing all 4 parks, so it doesn't much matter if were closer to MK or Epcot, etc.. I just want the most "disney" oriented resort
boy, it really is a hard decision. each resort has their own special magic about them.
Being able to see chef mickey's (and hear it) from your hallway outside your room is really cool for the kids, as well as the monorail going through your building. The view cannot be beat (you have to pay for an MK View though). But, you're up high, whereas in the poly, the rooms are only 3 stories high.
In the CR, being able to just go downstairs for breakfast in the fast food place in the CR is really nice too. Then again, if you stay at the poly, the walk from your building to the main building to get the quick breakfast, etc, is a very nice, relaxing, hawaiian style walk, with the tiki tourches and hawaiian music playing in the background, bunnies hopping around and ducks too usually.
The CR is very 'convenient' w/ everything in one building (except laundry facilites though, they're in the wings), but I've never used them when staying in the CR for that reason. I love the shopping, the arcade and the new restaurant The Wave. We've never eaten at the California Grill at the top of the CR - that sounds great too.
Oh, how many days are you staying? Would you consider doing a split stay? Disney makes it very easy (we've done it a few times). It's like getting 2 vacations, switching resorts. It's really fun. Just pack appropriately for the switch, and it's not hard.
If you did 2 or 3 days at the CR or Poly, do 2 days at MK and one day at AK (just 1 bus ride then). Then switch to the Beach Club or Boardwalk, and you have Epcot and MGM at your doorstep for the rest of the days.
Hope I don't make your head explode now (LOL). It's always so hard for me to decide too... too many great, great resorts to pick from.