Didn't find the drive too bad actually, but Holyhead suited us better as what I'd save on Fishguard-Glasto was negated by the drive from home to Rosslare and vice versa. Also, we left home on the Monday night and had a stop in London on the Tuesday to collect supplies and get a night's sleep at a relative's place.
Drove to site the Wednesday morning and landed at around 1.30-2pm after a nice leisurely drive down. Ended up in one of the furthest pink carparks and, although there were no queues getting in, the campsites had filled up quick. Luckily, we only had the one tent, but if there is a few of you, you may be a bit further out than you want to be if you want to be together.