I'm a big fan of the sweet, tangy variant of burrito, which is why I immediately gravitate toward the yam/pulled pork combo at Big Fat. Even after moving to Northern California, I've yet to find a burrito place that can pull this flavour off.
Yes, the lines can be long, and yes there's minimal indoor seating. However, I'd say that walking around Kensington Market with burrito in hand is half of the experience anyway.