Also, it is not like having the set bonus forces you to use WoG at all times. You can hold it in and not use it.
Lets be completely fair here. The times when you need to use an oh-shit WoG is either after you get pounded down with melee hits (rarely), this should not happen with 100% SotR uptime, predictable damage nukes, now since these nukes are predictable, you can still save BoG for them, not like the set bonus auto cast WoG for you. The only thing left is taking more unpredictable damage nukes, this is often from standing in shit, abusing mechanics for vengeance or just general failing.
I still feel like that is what we have AD and LoH for. I already got 2 abilities for oh shit situations. If I really need a third for some fight, I can save those BoG stacks.
What you also need to remember is that after using WoG to generate holy power, you basically instantly gets up 2 stacks of BoG, with DP you also have 43.75% chance of getting 1-2 DP procs. In a matter of a couple of seconds you should be back up on 3 stacks which is still a respectable WoG, so it is not like you are completlely giving away the opportunity of
This is the biggest problem with the set bonus I think. I personally love it, but it terrible for the "average" players. It is really just appealing to the top paladins. It will really require you to have a great ability to maintain your rotation to get use from it.