My most intense to least intense list would be:
Expedition Everest (several big drops, and the backwards portion is very intense)
RnRR (the take-off is the most intense of all the rides, but the rest of the ride - even the upside down parts - is not bad)
Space Mountain (not the fastest, but because it's in the dark & you can't prepare for what's coming, it feels like a bigger coaster than it is)
BTMRR
TZTT (gentle free fall -- looks way scarier than it actually is)
7DMT (bigger kiddie coaster)
Barnstormer (little kiddie coaster)
You should absolutely ride 7DMT! And I'd also recommend Space Mtn & TZTT for you. Space to me feels similar to BTMRR in intensity. And I find TZTT less intense -- just a different feeling, and feels nicely cushioned at the end of the freefalls.