Hey, what's 90 feet? You'll have to fly in from the UK, that's MUCH higher. You can do it! (Even if you have to bring a paperbag to breathe into).
Seriously though, TOT is so much more than the drops. The theming and special effects on that attraction are what it's all about. Unfortunately, they can't be described adequately, they must be experienced, and if you pass this one up, you'll be missing out on what's arguably, Disney's finest hour. Come on, go on it!
You also have to consider you're not really 'dropping' versus being 'pushed' down. Part of the thrill of the ride is seeming weightlessness as you are dropping. This is enhanced by the elevators being pushed down also.
It's a definate MUST DO do you. 90 feet is nothing. The Top Thrill Dragster coaster in Cedar Point is 420 feet tall. Now THAT'S a ride.
Super coward here but the ToT is my favorite ride. The drops are a smooth as silk and the air time is incredible. It's the closest we earthbound people will ever get to weightlessness.