I think it's also a case where an attraction may not draw the masses but has dedicated fans. There are attractions that everyone rides and most people like, but few people love. With Maelstrom, it didn't have long lines, but it's such a goofy ride that it's easy to see why it had huge fans.
I'm also heard this comment about Horizons, which didn't have big lines in the end. Part of that issue (and with Universe of Energy too) is that it had a HUGE capacity. There's a big difference in having a modern attraction that's four minutes and only can take 1,200 people an hour versus a 15-minute attraction that can take 2,500. It's easy to look at something and see the lines without thinking of why they're in place. FastPass also makes the Standby lines much longer across the board.