Yes and no.
It's rare that I feel for someone like that. But oddly enough, I'm in one of those rare moments.
Absolute infatuation, mentally and physically.
I catch a glance, and it physically feels like someone has punched me in the chest. They're all I think about when I have a spare moment. I'm always on the lookout for them. I hang on their every word when we talk. I've stood outside in the rain, the cold, and the direct summer heat just on the off chance they pass by (well, and so I can have a smoke, but hey - I've lingered outside longer than I had to!

).
And them seeing me, and coming up to me with a big grin because I was there was the best feeling in the world. When they followed me back to where I had to go and poked their tongue out at me in a cute way, I just about died on the spot.
When they haven't seen me, I find I can't shout out a greeting because there's a lump in my throat.
I've never had it this bad, by far (I blame the T).
He's a coworker. And straight. And he has a girlfriend. To top it off, I'm in the closet - both regarding being trans, and being gay. If anyone ever found out, my career would be over. My social standing would be ruined.
But I'm used to it. No person I've ever loved like that has ever reciprocated.
I once had a crush - but nowhere near as strong as this one. Went on for years. My ex found out... and told them. I played down my attraction. Being told that they "didn't see me that way" was the thing that finally allowed me to get over them. Yes, it hurts, but sometimes it's what you need to hear to move on.
Just be thankful you're in a position to hear what you need to hear from them.
Errr... sorry for the emo post folks, I can't tell anyone I know in real life about it - so it just kinda slipped out

I'm normally much more private!