I gained the most from gobase.org, just clicking through professional games. The tool you can review/replay games with lets you try to guess the next move - just let them play the first 10-15 moves and then start guessing. Don't spend a ton of time thinking, just _guess_. Guess over and over, and if you don't guess the move after 5-10 tries, have it tell you, try for a few seconds to understand why that might be a good move, and continue.

You should totally do the tactics and puzzles that you can find (that same site has a bunch), but there's a lot more strategic recognition and pattern-matching in go than chess.

I'm also interested to hear if there are better tools though in the last .. Christ, twenty years? I'm old now -.-