We almost always stay at the Poly Concierge - both garden and lagoon. I cannot imagine a better place to stay which is why, I suppose, we always stay there!
It is sooo convenient. It's great to have the monorail to the MK which is still our favorite park and my boys are 10, 13 and 16. We love MGM, but the hours there are usually shorter than the MK - so we always come back and go to the MK at night when fewer people are there. We can usually walk on to many of the rides we love - Splash, Buzz, Pirates, etc. You can walk over to the TTC and get to Epcot easily.
The Poly is just soooo convenient. And with the lounge - you really have a lot more room than a typical hotel room - although we have no problem with the room for 5 of us in the room. If you have kids that pitch fits about sleeping together - then you might have a problem (of course - they are queen sized beds). My kids know when they start griping about sharing beds - they will give up the Poly concierge.
My kids love the volcano pool at the poly and it is so close to the Concierge building. Your kids are like mine - plenty old enough to be out there when a lifeguard is there - without you....and it is easy to check on them when you want to.
For us - the concierge breakfast is wonderful - I like to be on vacation when I am on vacation so I don't like having to worry about food and getting them fed. They can just walk down to the lounge and eat until they are full in the mornings! It is a pretty high carb breakfast - but they burn it off as we go through the parks.
I say - go for Poly LVC - nothing beats it!
