We went last year over Presidents Week and we loved it. Of course, we had just been there over NYE so compared to that the crowds seemed non-existent. We didn't have a choice since my fiancé is in medical school so we have to go when he has breaks, but we have always wanted to go for Valentine's Day and since it was all the same weekend last year we went. We arrived the Thursday afternoon and MK was pretty empty, Friday wasn't too bad at AK, and Saturday at MGM was fine too. Sunday and Monday were pretty crowded at MK, with very long waits for Splash, Buzz, and Space, but the other parks weren't bad. We were supposed to leave Monday night, but that blizzard hit DC so we were 'snowed in' at WDW till Thursday night. Aside from the unexpected expense of the extra nights at ASMu (we luckily have APs), this was great since Tuesday-Thursday the parks were not very crowded. Average waits were 20-30 minutes, though some of that may be due to the fact that many people had their flights cancelled and couldn't get to Florida. Obviously many others were like us and stuck there, but when we were extending our stay at the check-in desk, we heard lots of people saying that their child's dance/cheerleading/band team couldn't get a flight down to Orlando for a few days, and there were definitely a lot fewer people in the parks after Monday. Also, I guess, people with hoppers might have used all their days so they spent the extra time at the pool or whatever. The weather was great all week though, pretty warm and it only rained Sunday night (after we had waited over an hour for Fantasmic). So based on my experience, I would put Presidents Week at the beginning of your trip, that way the crowds will die down as your vacation goes along, making it more relaxing when you're tired after having been at the parks everyday.