<<Alternatively what old album have you returned to not paying much attention to before?>>
Night at the Opera by Queen. Always found it completely overrated. Just two songs ever stood out for me: Bo Rap, which I agree is worthy of all the praise (YMMV obvs) , and and Love Of My Life. The rest of the album was IMO just totally forgettable B-sides, especially the meandering Prophet's Song where nearly three minutes of its prolonged 8:21 agony is Freddie showing us he's bought a tape-delay and he's not afraid to use it to mutitrack his acapella wails.
However one of my kids has been studying Bo Rap in their GSCE music lessons at school and has been streaming the whole album quite a lot over the recent easter break, through my speakers. Not sure whether it's been a case that I finally 'get it' after 43 years or whether it's more a case of having become comfortably numb to it, but I find I appreciate the songs more.