I did - but I mentioned in it my personal statement as well (in a different context that showed another personal characteristic I wanted to display).
Just thought I'd throw in my two cents about coming out on apps (especially with that other thread where someone was paranoid about it). Obviously, you have to be true to yourself and do what feels comfortable for you. But for me, being LGBT has definitely influenced my wanting to be a physician. More importantly, I believe it has given me qualities that will make me a better physician. But even if I didn't believe these two things were true, I still think it's relevant to include (in some context/anecdote that shows something valuable). I don't want to go to a school where being LGBT would be a negative factor...so best to let them know from the get-go. Or even better, the schools that are looking for LGBT applicants and have resources to support them will be more likely to seek you out.
Being LGBT can be made relevant very easily - especially in an open-ended prompt like this. You shouldn't worry about it feeling forced as long as you're speaking from the heart. To be honest, when people say that leveraging a social identity is "forced" I cringe because they probably don't understand how big of an impact minority identities can play in your day-to-day...
ALSO, I totally support our LGBT med school