I haven't honestly heard of these people. Though it would be useful for GMing I imagine. I'm not sure if I have the patience to listen to them, however, as I am far too eager to engage in my own experiences. Perhaps foolhardy, I know. I just don't have enough GMing experience under my belt to gain as much from these as actually running a game myself would do. Also...have you heard of Pathfinder? I didn't really like the direction 4th edition took, which while it made the game more approachable to those new to tabletop, it denied me my laundry list of skills and I feel over-simplified everything. Pathfinder makes some tweaks off of 3.5, such as giving Wizards and Sorcerers d6 hit dice, while improving some other classes' hit dice as well, and making the skill list more manageable. Now, instead of Search, Spot and Listen, you have Perception. Hide and Move Silently are just Stealth. Jump and Tumble got rolled into Acrobatics. On top of this, you get more feats, and a more reasonable skill system which allows cross-class characters to not be gimped in the class skills for their second class. You only get 1 rank max per level, but any skill that is a class skill which you have ranks in gets a +3 misc bonus.

Though...you probably already know about Pathfinder.

I am indeed familiar with pathfinder. :) While I a not personally experienced with it, I did used to have a sizable collection of D&D 3.5 books. Sadly most of them have left my possession over time, but I still have the core books at least. :)

I will agree that they did simplify an awful lot in 4E. However, Any good DM would be able to overcome this I feel. Whether that be by requesting two separate rolls for a move silently, then a hide check, or simply requesting the player to give specific details about their efforts in being stealthy, etc. I have been playing 4e for about two and half years now and have fallen in love with he system. Particularly as a DM. With 3.5, it would take me HOURS, sometimes a few days to prep for a game session. Now? I spend two hours tops and it's every bit as fun for everyone involved I've found. Does that make it better than 3.5 or pathfinder, no. Just makes it different. And for every different game, I feel that any good DM will be able to overcome anything players may have against a given system. :) Because believe me, I had plenty of issues with 3.5 as well. lol