Of course, there is a place for large scale social tastings. And if people enjoy them they certainly should indulge themselves. I go to the occasional jebus but largely to see my friends, not really to enjoy wine.
On a professional level, I attend many large tastings. I always view my tastings there as approximative (tasting new vintages from vignerons, etc.) but always expect to visit the vignerons afterward and spend a few hours tasting new releases, from barrel, assembling blends, tasting old bottles, visiting the vines, telling jokes, breaking bread and just basically getting to know the vineyards and the producer. Pre-cancer, the most I could do was three a day. Of course, I take notes as I taste.
My objection is to the tasting note becoming more important than the vineyard, wine and vignerons. My objection is to the tasting note substituting for the wine as an evolving experience based on context. I think this is a recent phenomena and a regrettable one which reduces live wines to a commodity fetish. Vignerons produce live wines, not material ripe for transformation into tasting notes.
Personally, I take notes whenever I taste wines and I find this useful for my memory. But I don't confuse my tasting notes for the wine. The tasting notes are only approximations.
Lastly, I think the tasting note proposes some sort of hokus-pokus expertise as a substitute for listening to and understanding the wine. It is part of the culture of specialists and experts (I am a guy with two oncologists) which seeks to mystify the natural world.