Probably moreso in the UK, I believe they had a bigger impact in the US. During their active years only two of their albums made the top 20 and one of their singles. Their biggest hit is the re-release of Light My Fire to promote the film in 1991.
It’s not that they were unknown and never mentioned but they were relatively obscure and I only heard talk from musos and then suddenly a lot of people my age were into them. My impression at least was the iconography was bigger than the music before that, I can’t deny Morrison was a very handsome and photogenic man.