1. Tall girl = Big feet
This one is easy. My socks are approximately 1.5 inches longer than your socks (on average). If you do the math, and I have, that is about 2500 more stitches I have to knit for a pair of socks. If I plan on knitting 12 pairs for myself this year that is 30,000 more stitches I have to knit.
2. Tall girl = Long legs
I decided to knit myself some knee socks. I'd surmise that I have to knit 1.5 inches more on the foot of my knee socks and 1.5 inches more on the leg portion. We're approaching >5000 stitches more for me, compared to the average person, to knit those babies. (Who had the great idea of knitting knee socks???). And that's why they are stalled out...
3. Tall girl = Long torso
Not all tall people have long torsos. We come in a variety of tall sizes; some have longer legs and some have longer bodies, but in general, we are all somewhat longer in the body. I'm knitting a little vest right now and I started the neckline last night. It's short. I added length to the bottom but it's still short. The instructions were based on row numbers not inches and this is the problem. I always add length but it's generally a crapshoot. Do I add the length before the waist shaping or after? Do I add length in between the waist shaping and chest shaping? Or some combination of that? This is why top down sweaters are a tall girl's friend. I can see why Stefanie Japel has made her entire design career out of top down sweaters (she's as tall as me! she actually could look me in the eye).
I think I've sufficiently complained enough now. There are advantages to being tall, like never needing a stool, but in terms of knitting, there are few advantages to my size. If you're asking, I'm 6'2". In sock feet. Hand-knit socks of course.