This is always an interesting Topic - and what always surprises me is how Intensity can be Subjective! You would have thought everyone experiences intensity and forces the same, but it's not the case, and it's amazing to witness a group of enthusiasts get off the same ride and have differing opinions ranging from 'that was too much' - to 'that was meh/forceless' - humans literally have vastly varying tolerances , so thats one thing!
I think I made a post back along about 'good rides - that where too intense, or that you didn't enjoy' - I can go on a really intense coaster, appreciate it as a GOOD coaster, but I can't admit to loving it or particularly enjoy it! I just don't like greying out or intense G's nor do I like rides with too much of a headachy 'roar' to them!
My favourite coasters are the ones that are Thrilling but fun, I love airtime machines and smooth transitions, I love speed, launches and (smooth) twistiness , they make me want to re-ride. If I've been on something that made me grey or white out - I'll likely be 'okay that....something' and I'll probably not ride it again that day! My type of coaster is one I come of laughing and buzzy and want to run round and do again! If I come off nauseous or 'jangled' - that'll be filed away for later.