My H's lack of decision making in our marriage, although very frustrating at times, was never a deal breaker for me so I may not feel as strongly as your W does about it, but I can understand her frustrations with it.
My H is also a very easy going guy. On the surface this seems like it would be a good thing but there are definitely times where he is just too passive and I want to tell him to get a spine and make a decision already!
Being too passive makes a person look weak, it makes a person look like a doormat, it makes a person look like they won't stand up for themselves or for what they believe in.
It is just so frustrating to have a person in your life who refuses to own his opinions or his thoughts.
I am tired of making all the decisions for our marriage,big and small, and him either reaping the benefits or him being able to deny responsibility with things go wrong.
In the case of my H I believe part of his issue is that he tries to avoid conflict at all costs, but that conflict avoidance has now lead to us to not dealing with the growing problems in our M to the point where it is almost too late.
As for 180’s you can do, state your opinions on things and don’t apologize for them, and actually have opinions on things, don’t be wishy washy and let her call all the shots. Show her you have your own mind. Speak up about things that matter, even small things. She needs to feel like you are sharing the responsibility of decisions in your marriage. That it isn’t all on her shoulders. And she needs to see that you have a spine in there somewhere. Show her you are a strong and capable person who can make their own decisions.