We went during spring break last year and the lines weren't too bad. Some of the lines were worse than others. I think the longest we waited in line was about 15 minutes, but that's because something happened with the slide right before it was our turn to go down and they had to fix whatever was wrong.
If you notice the lines are too long, just hop in the lazy river. It's easy to spend hours there. It's the best lazy river I've ever been in.
Also, for some of the slides, you wait in line in your tube in the water. I found it made waiting much easier.
We also booked a room at the Comfort Inn and I felt like it was definitely worth it.