Don't think I've ever done it for the entire game, but I played plenty of games where I used it a lot.
In Tales of Symphonia, once you got to the other world, I had no clue where to go or whatever (missed some NPC clues I guess?) and just opened the walkthrough and finished the rest of the game with it.
Most recent example was Darksiders. First part of the game is easy with puzzles but in the final dungeon there's a pretty big difficulty spike so I just finished it by following a video walkthrough, even though I could've finished it by only looking up 1 or 2 puzzles probably.
In Tales of Symphonia, once you got to the other world, I had no clue where to go or whatever (missed some NPC clues I guess?) and just opened the walkthrough and finished the rest of the game with it.
Most recent example was Darksiders. First part of the game is easy with puzzles but in the final dungeon there's a pretty big difficulty spike so I just finished it by following a video walkthrough, even though I could've finished it by only looking up 1 or 2 puzzles probably.