Hiya,
last year we went then - UK half term time so it was a bit like britsville but not that busy (apart from Sat - and Wed not all French kids have school on Wed). It was quieter than the post easter trip we've just been on, but still busy after about 1pm till 5ish - this trip we stayed at DCR too! Went to park for early magic hours and went back to DCR for the pool in the afternoon - worked really well! Rides quiet in the morning.
Tessa