I use it but somewhat sparingly. In addition to hiding posts and comments by the specific user it also hides all children comments replying to that user. You'll know if a post has blocked comments because the comment count will be greater than the number of comments you actually see. Temporarily disabling user blocks can be done by opening a private browser window that doesn't have your cookies. Fully removing a block can be done on the blocked tab of your preferences. Another great feature is mute sub which removes subs from /s/all. Your home page is configurable in your preferences; You can set it to /s/all rather than the default /s/subscribed.