I've heard and said for years, the single greatest difference (maybe the ONLY worthwhile difference) in professional fishermen (or even the 'sticks' who win everything locally) and weekend Joes is casting ability. The ability to use a baitcast reel and put any lure, any where, every time. Coincidentally, I've been off this week recovering from surgery, watched a buttload of YouTube videos, saw KVD say that exact same thing just yesterday.
I don't believe that it's the only difference, but think it makes people feel good to say and the pros repeat it so they don't hurt folks' feelings.
I have in the last 25 years fished with pro anglers at the top and bottom of the FLW and BASS lists, including Kevin, Skeet, Ike, Nixon, Ish, Gerald, Guy Eaker, Rojas, Biffle, Shin and others. I've seen guys at the bottom of the standings cast their asses off but they couldn't find winning fish to save their life, which IMO is the difference — finding and catching winning fish.
Can one of us skip a frog or jig completely under a dock - and I mean completely under, back in the "can't get there" edges? They all can. Or under willows on a cut bank with just a couple inches clearance. Or hit the target on a cast to hit a stump 90 times out of 100.
A lot of us can do those things. All of those guys can. But if the back of that dock or under the willow bank or crankbait stump doesn't have fish on it then it doesn't matter. Finding and catching them is the key.
That said, they're pretty f'king remarkable casters, no doubt. I always got a kick out of saying "Can you put it there?" and as they were doing it they'd say "There? Right there? How many times?"
Some of y'all may remember Craig Powers from east Tennessee. I'd put him up against anyone in a casting contest. He was remarkable.