Is this K+4P vs KB+P endgame drawn? Is that position always a draw? I've tried to play it few times and I always end with lone bishop or a stalemate

8/3k3/p7/2Pb4/PP6/2KP4/8/8 w KQkq - 0 1
You cannot get a definitive answer, but in all likelihood, 99.99% it is a draw no matter who is to move (I am the type of person, who never says I am positive unless there is 100% proof, and that is impossible here, however likely).

The overwhelming factor in this position is that the black bishop does not control the a1 square, so even if white had no pawns, it would be a draw. It is clear that white can also never break the blockade either if black just plants his king on c6. It would remind me of an opposite color bishop blockade, but white has no bishop. Just Kc6, and Bd5-h1 with an easy draw.

The only reasonable exception would be if somehow white played a5, and later was zugzwanged into having to play b5 (like eventual stalemating the king on a1, forcing b5. That said, just avoid a5 (white can actually play b5 right now if on the move to avoid that issue).

It seems like a pretty easy draw either way to this long-time Master.

P.S. My Stockfish at a depth of 48 still reads 0.00