I normally stay at the Premier Inn at Eureka Park - 12 minutes up the M20 from the tunnel. It's soulless and the only food choice there is the Beefeater next door. But it's convenient.
Or, if I go over the day before I stay at Chateau Tilques on the other side and have a nice dinner and leisurely breakfast. Not both at the same time.
Yep, Chateau Tilques is my current favourite. The waitress there is rather nice too.