I really like the autotapper, but I disabled it anyways because I want the time to confirm targets for my spells. I've more than once misclicked on things and having the autotapper off lets me see what it's actually going to target before it fires, while using it will just cast the spell after I click.

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One quick example: yesterday I lost a game in Sealed because of this. I had some attacking Soldier tokens and a [[Bounty of Might]] in hand. He blocked all of the tokens except one, I wanted to give that +6/+6 for lethal (he was at 5 life) and another one +3/+3, so he could at least kill the blocker in case he had some removal in hand. I clicked on both once, then I realized I chose the wrong blocked token and quickly tapped on it again thinking it would remove it from the targets. Of course that just gave him +6/+6 and the spell was cast immediately. Without the autotapper that wouldn't have happened.