The English schools have half term in mid-February - its usually around the 18th, this year (2007) around half the schools were off one week, then the next week the other half were off.
I took DD to DLP in Feb half term this year. The queues were manageable (Peter Pan and Buzz were very busy, as was Dumbo) and Fantasyland got really busy all over from about noon onwards. The Studios were quiet, and the most I queued there was about 20 minutes for the Tram Tours. We had no trouble getting great places to see both parades, and didn't experience a lot of pushing and shoving at all (except for the characters in the main park - I just wouldn't bother now). The studios seemed to be much more organised for character meet n greets.
Elaine