That opinion of Pink Floyd is all because you weren't around when they started. I was managing a record store in LA back then and I kept one copy of each of their old albums in stock because we had a reputation for having the entire catalog of artists repertoire. Pink Flyod's first album was the Piper at the Gates of Dawn in 1967. David Gilmour replaced Syd Barrett for Pink Floyd in 1968 shortly before their second album "A Sauceful of Secrets" was released. In 1969 they released "More" and the studio/live Hybrid "Ummagumma" album. In 1970 they released "Atom Heart Mother" which featured an orchestra and a choir. In 1971 they released "Meddle" and in 1972 they released "Obscured by Clouds" All this time they remained a niche group with a cult following. None of these albums were big money makers. Their talking bits and strange ethereal passages weaving in and out of their music originated from these earlier albums.
Then, in 1973 they were an "overnight success" with their 8th album "Dark Side of the Moon", which was a great album and became known as "the best album to listen to when you're smoking pot". In fact in September of1973 when Pink Floyd played the Hollywood Bowl, the Chief of Police pulled most of the police in the LA Metropolitan area out of their normal beats to work the concert making sure that no one was smoking any pot there. There were literally hundreds of police there and everyone was searched when they entered. There were no big arrests made that night but violent crimes skyrocketed including murder, rape, and armed robbery. The Chief of Police got in all kinds of trouble for that "realignment of resources".
Listen to the first cut from their first big hit album Dark Side of the Moon (album #8 for these "newcomers"). The entire album is on that video, but just listen to the first cut to see what I'm referring to. It incorporates a heart beat, sounds from a cash register, people talking, a crazy person's laugh, a helicopter sound effect circling, etc., to build up to a huge crescendo and resolution. And after the singing stops it gets "out there" again until the alarm clocks herald in the next song. None of these thing were being done at the time. It was all new stuff that no one had ever done or heard before and it was great!
I think Pink Flyod more than paid their dues as a Progressive group.