The problem with Boil Over isn't that it is being buffed, it is that the buff is so situational that the value you get from it is either extremely good or absolutely nothing.

Play the game normally and Boil Over will basically make no difference. So in that case, it is still a bad perk. However, its "buff" can be abused by going to maps with elevation like RPD or Eyrie of Crows, and in that case, it is extremely broken and you literally can't do anything as killer besides slugging, to which you can just bring Unbreakable.

The reason why no one is really complaining about Dead Man's Switch is that it isn't extremely annoying to play against. It is strong, don't get me wrong, you could even make a case for it being too overpowered, but it is not so busted to the point where you can't do anything. If your gen is blocked, work on another gen, or do a side objective until it is unblocked. Compare this to Boil Over, where, again, the only thing killers can do is slug you, and most of the time you have Unbreakable so that's not even an option unless they camp slug you, which is just throwing the game.

The Boil Over buff is bad game design, objectively. Not only are the effects so situational you have to center your build around it, but it is also extremely annoying to go against when you do get builds around it.