I miss them!! It's been a while since I've been to WDW (or read any guidebooks, boards, etc), and when I started planing my upcoming trip, I was very sad to find them gone. Yes, World of Motion was gone when I went in 98, but Test Track wasn't open yet, so it felt to me like we just skipped the ride, not that it was gone! Since I haven't ridden Test Track, I'm not passing judgement on whether it is a worthy replacement just yet.