Disaster Transport became a disappointment over time. But if you look at its debut (10 years ago this May), lines for this ride were quite long all season long (and at least the queue was air conditioned).
And while D.T. is still considered a roller coaster, in reality, it's just an enclosed bobsled ride. When Avalanche Run was constructed, it wasn't considered to be a roller coaster until they (CP) put up walls and a roof over it, gave it a theme, and a change of name.