I'm not going to agree with you that we have been spoiled with WR depth over the years; many of those years we were spoiled with a QB who could buy time and find a WR is more like it. Starting way back, I'll admit we were spoiled with Swanny and Stallworth on the same team.
Since then, not really. We had the 80's which had one WR star, Lipps. I'll admit he was good but not much other than him. The 90s saw Jeff Graham, Ernie Mills - good WRs but nothing to write home about. Hastings and CJ the same. Hines Ward, a fan favorite for good reason was added in '89. He was something special, eventually, but not for a while until Ben came along. Plex came in 2000, not "all that" but decent. Randle El came in '02, not great but a part of a decent group. I wouldn't call them "outstanding." Just "serviceable." That group was good enough to win a ring in '05 along with a sold D and rushing game.
And by '05, everything had changed with the emergence of Big Ben. He was something special. Then came AB, truly an advanced WR in a lot of ways, with a standard level of "Ben-Made WRs," who didn't do a whole lot outside of Ben's realm (I include Wallace, Holmes, Sanders, Bryant, Coates, Ju Ju, DJ, to an extent). But, we've never really had a "stockpile" of WRs, Ben made it look like we did. It is a common misnomer to say Pgh drafts WRs so excellently. They've done OK, but with plenty of misses to their ledger: Claypool, Austin (so far), James Washington, DeMarcus Ayers, Dri Archer, Marcus Wheaton, Justin Brown, Toney Clemons, Limas Sweed among those not mentioned when speaking of the Steelers' advanced WR drafting. For every AB there are 10 misses not ever discussed.