The violin bow bit didn't impress me that much, and not just because you know that was the other inspiration for that one scene in Spinal Tap, which is far more fun to watch. It's because it seemed mostly a visual thing--whoa cool he's whacking his guitar with a violin bow! Then you realize those noises he's making aren't really that interesting.
And of course, who knows what all dope they did on that tour. Probably every dope there was to dope on.
See, when Plant did those little "mumumumumumow!" noises during "Kashmir" on Celebration Day, I liked 'em. But not on TSRTS!