I was in Japan in March/April as well, visited Disney over 3 days April 11-13. I had zero lines but that was in part to the lousy weather. You're making me want to go back again soon with all these pics. Nice one.
If you find yourself lost in the train system someone will usually try to help you out if you look suitably confused (it happened to me a few times ). Having said that tho, the train system is very easy & the only time I had troubles was when the station names board was only in Kanji. I travelled all around by myself with little problems tho.
I'm not sure what areas you'll be in, but for a great cultural experience the Kansai region can't be beat. Kyoto & Nara have some amazing temples and gardens.
Finding cheap food is relatively easy, just be prepared to point at pictures & not really know what you're getting I ate at alot of little off-street places (not really restaurants), where you sit along a bench/bar table while they cook in front of you. Raamen is a great cheap meal that fills you up.
I liked it, but yeah it could've been alot better. The weird 'trick track' element was so lame, it did nothing, but the first drop was great. What really annoyed me was the amount of speed you have coming into the brake run after the final drop, the ride could've been alot longer...