I think it started for me when Lee Dorian, of Napalm Death fame, brought out 'forest of equilibrium' with Cathedral.
Local (to me) bands like Bluuurgh, Celestial Seasons, Orphanage, the Gathering and Within Temptation all took a sip from the Doom cup in the 90s.
Other great discoveries in the record bins were Sleep's 'Mountain of Madness' and some St.Vitus ep I had long forgot I had until just now!