I used to use bubbles but switched to rough drawn rectangles. The rectangle method is not much different than using bubbles. They are hand sketched and corrections are made by copying on another layer of cheap tracing paper. I use a marks-alot on the end sketches, turned narrow is a partition wall and turned flat is a brick veneer wall.
But I tell most customers to come to me with a bubble diagram of what's in their head. Most say they have no idea what they are thinking about but 2-3 days later they come back with a sketch of something. Then I take that and try to make something nice out of that. Saves me a lot of time, and the customer is more likely to feel "attached" the the house.
I'm not in this to make my ego feel good, I want to draw a set of plans that will make the customer happy and serve his purposes well. After 40 years of doing this it's what works best for me.
I have an associate who takes the customer's requests, comes up with a sketch and presents it to the customer. He uses the bubble method. He really has the "architect" mind set but is not licensed. Then says to them "take it or leave it". I've gotten to work with a lot of his customers who "left it".