I'm about 5' 10", sometimes a touch less depending on the measuring tape. Not THAT tall in the grand scheme of things, but taller than most of the people I know. (Including my 5'2" significant other. My collection of 3" heels doesn't see near enough use, lol.)
Being able to easily mount a 2 or 3 year old colt those first rides, or that 16hh horse without a mounting block is definitely a plus when you've got a little height. Plus you can wrap your long legs around a bucking horses' belly for extra security, lol
Finding XL western jeans is tricky - a plain old Long is just about right when you're on the ground, but I want my jeans to still cover my ankles when I'm on a horse and that requires a 38" inseam. Finding tall enough English boots and English saddles with long enough flaps to accomodate long legs is tricky, too! Not to mention it stinks when your breeches' knee patches actually cover the mid-thigh...
In everyday life, I've resorted to making some of my own clothes so I'm not going to the office in a blouse with sleeves that don't quite reach the wrist or a shirt that isn't long enough to cover the waistband on ankle-length slacks. I found that (long enough to not show my junk) skirts & tank style blouses are fantastically easy to whip up.