I think if you put his work in the context of how he sells it, it makes more sense - he's not an epic landscape photographer making fine art prints and selling calendars, rather he sells images to travel magazines and stuff.
Also I'm extremely jealous of his life style so even though his images aren't the best, I like to watch his videos
WRT Brendan Van Son, I came to his channel from his first collaboration with Thomas Heaton and enjoyed his videos.
He's always been open about his business, and used to do monthly videos detailing where he made money and how. He was never about making money selling fine art prints and has admitted that he's not the best landscape photographer and that he does consider some to be better than him.
Sure some of his images look touristy, but that's part of his business, in some cases it's assignments for the tourism industry and others, it's commissions for magazines or for stock.
That said his images are still better than many of mine, but he's been doing it longer.
As for whether their workshops are worth it, they are on the expensive side if you're looking at the Patagonia/Alps trips, but Brendan has recently run cheaper workshops in Crete that were only a couple of hundred quid and Thomas has been running a couple of UK based workshops that are cheaper. Their worth to you depends on what you want to get from it. For some it's the combination of the chance to go to a new place, to go to locations you might not find otherwise, the chance to get some instruction from a more experienced photographer, for others it's just the chance to be in a group with other photographers.
For both the Patagonia and Alps trips, BvS and TH did have guides with local knowledge and they had been to some of the locations before, so you would benefit from that aspect.
There's still plenty of places in the UK that I would like to explore and shoot, so I definitely enjoy their videos where they explore the UK, but I do like seeing other places around the world for inspiration.