We've been going second weekend in Feb for the last two years.
Weather year before was COLD. 33F there and 34F here (Detroit). They had massive landscape frost die-backs. It was pretty severe for the plants (we were fine - just kept laughing at the irony of our 'warm weather escape'). Crowd were fine.
They did have cheerleading competitions around that time both years. The first year we were in CSR, and had to endure teenage stuff (up late, noise, etc.). We had conferences, we weren't there to relax, so it was no biggie.
Last year, weather was great. We tried POP Century, and it was quiet. The ME crowds high (cheerleaders, I think. Some school group), but park crowds low.
We're going this Feb. too. It makes a nice weekend get away and an escape from the winter blahs. Have fun!