As a brand new player to the game, I cannot comment on the "old" vs "new" controls, but I can say that the controls right now are by far the biggest impediment I'm having to actually enjoying and engaging in the game.
As a fresh mind to the game ...why is there separate "grab" and "hold"??? Instead of enjoying the content, storyline, puzzles, etc, I am mostly just struggling to keep the arbitrary division between these straight and not grab when I want to hold. Do you eat by pressing the grab key while holding the food, holding the grab key while holding the food, setting the food down looking at it and pressing the grab key, setting the food down looking it and long-pressing the grab key, setting the food down and looking at it and long-pressing the hold key, clicking the left mouse button while looking at the food, clicking the right mouse button while looking at the food, clicking the left mouse button while holding the food, long-pressing the right mouse button while holding the food? The fact that it could really be any of these is agonizing. The effect of the tutorial was mostly to teach me that there are a whole bunch of buttons this could be, and then I end up spending a bunch of time and effort hunting down food in the help menu (jesus christ, is food a "main gameplay loop"? or something else? I have no idea), and then I do it all again the next time I have to eat because there was never an internal logic that really made the answer click into place for me - repeat ad-naseum for numerous other things.
By trying to bind to a controller so that I can play the game while relaxing on the couch, quite a few obstacles get introduced that are probably out of the scope of this particular thread.
What the game has really taught me so far is how important it is and why it is every other game has such simple and straightforward inventory and interaction controls. I want the minigames to be the minigames, not figuring out if its shift-click on the signal triangulate console or if it was stick-my-finger-up-my-ass.