I use a beard trimmer with a guard, but much more conservatively. I trim the hedges and the chest with a #3 or #4, shave a few strays on the shaft, and leave my legs alone. You wouldn't know I trimmed unless you'd seen me before: it really cuts down on the bush, but it doesn't look unnatural.
Mainly I do it as a courtesy to women who don't want a faceful of curlies.
I ask for women to do the same for the same reason: also because, at 6.5" around, long pubes can get sucked into the vortex and scratch up the sides of my penis. Yes, it's happened, and it's really unpleasant.
I saw a porn clip once where the guy was totally smooth except for a tiny patch above the cock. To me, this looks like a Hitler moustache, especially with an erection doing the Sieg Heil. You know when you start laughing at something that really shouldn't be funny, but thinking that just makes it worse? Especially when he got down to business...I was lucky the guy didn't have a German accent.
It looks strange on women too: I understand trimming down to a neat triangle, but the tiny "soul patch" just looks out of place. If you've gone that far you might as well shave it clean.