I guess I'm old school in that if I want to ride something, I'll wait for it and don't have a problem doing so (within reason, 2 hours in an actual ride line is roughly my max). I just don't get the mindset that has taken over with almost every single thing these days that "time equals money" and all that crap when it comes to trying to relax and have fun. Heck, Forbidden Journey's line is more enjoyable if the line extends just out into the greenhouse (approx. 45min.) and isn't moving so fast that I don't have time to really enjoy the rooms of the line.
I have a feeling the HE and Gringotts lines will be just as engrossing, so I really wouldn't think twice about being willing to wait an hour, or maybe more. From the sounds of it, the themeing and design of the lines are actually better appreciated with a decent line. These are not bare switchbacks (excepting the extreme overflow sections) like at Cedar Point or Kings Island, but you should know that. Sorry, I have no snark filter, but it will be October, and not even of the opening year. If the lines are longer than you expect for Potter attractions (and I doubt they will be unless this does even more for attendance than Phase I did), just roll with it, since they're designed to be enjoyed and appreciated at moderate line lengths. You really don't have any reason to be concerned about lines, though, if 2010 is any indication.