When I pee on the toilet, there is more chance of urine splashing out and hitting my legs. It's worse during summer when I wear shorts because I actually feel it.
Picking something off the floor takes like 5 minutes
Everyone thinks you have an extremely long penis, but you don't.

I get hit by airplanes.

so you admit that you have a small penis

I'm not tall but I knew a very tall person and they would sometimes hit their head on the top of doorways. This person i speak of is also an alcoholic so you can imagine this actually happened pretty frequently.

legs fitting in the "room" between airline seats

I'm 6'5 and consider myself small height wise. Tall now a days has to be 6'8 to 7-foot or more.
But I guess trying to feel comfortable in certain vehicles. Especially the older models. You have to cram inside.

I can't find underpants that fit my extreme penor

Cleaning mostly. I've been going to the gym lately so I don't feel like a piece of shit after I do simple chores, such as dishes/vaccuming. I put too much pressure on my back since I'm so tall and have to bend down a little.
Maybe it's just my posture.
No other downsides I can think of, unless you're really tall and skinny. In that case, clothes are a bitch to find since nothing fits. Either too wide or too short.

being able to see over the stalls in bathrooms without trying
getting into low riding cars
sitting in chairs that aren't long enough for your thighs
small toilets in general..