All Aboard said:JMD, you're missing on several cylindars here. On most days, M:S has the third or fourth longest line at Epcot. Soarin' is always longest, followed by Test Track and then most often by Living with the Land.
Common mid-day wait times during this time of the year are:
Soarin' 60-90 minutes
Test Track 30-45 minutes
Living with the Land 20-30 minutes
Mission:Space 20-30 minutes
Often, even when 20 minutes is posted for Mission:Space, the attraction is actually a near walk-on. And, they have the ability to control the capacity of the attraction by shutting down centrifuges, which they often due - running only two or three. The attraction is not nearly as popular as initially expected.
At Test Track, a car leaves every 12 seconds. It runs at full capacity (unless it breaks down) all day long.
As I just posted, this was not my experience last time I was there. Its quite possible that things have changed quite a bit since the last time I went. Considering that I'm going in two weeks, I hope your right.