Too much of anything can be a bad thing.
I once at least sorta liked it but I agree totally it has been overdone.
Unpopular opinion: I think "Imagine" by John Lennon might be the most overrated pop sing in history. I've had a few people think I have some sort of problem with the first line (as a Christian), but I honestly don't. As was pointed out in the censorship episode of "WKRP," it's IMAGINE there's no heaven, not a declaration there isn't one.
No, my problem with that song is multi-faceted. I think the piano itself (incredibly easy to play) is juvenile, I think the rhyme scheme is more designed to shock than anything, and his notion I should "join him" (us) in a land of no possessions and sharing all the world when he died with a net worth of half a billion bucks is a little inconsistent if I may be charitable. No possessions, no religion, no this, no this. I just don't think the song is that great, I'm not overly offended by the lyrics, but it's not some sort of deep thought exercise to me. Even the guy singing it doesn't believe the crap he's singing - but it's "sincere" and "profound."
Let me put it like this: we had an atheist musician along the lines of John Lennon who ACTUALLY DID the stuff Lennon just wanted to imagine. His name was Harry Chapin, and in my opinion he was ten times the musician who believed what Lennon only imagined with how he lived.