It took me like eight. I partially agree. My experiences of Solaris and Andrei Rublev were pretty much the same (the former features something like ten minutes of highway footage from the inside of a car), but I have to say that I still remember loads of details from all three and I'm glad I watched them.
PDP, isn't the line "my favorite Bergman movie is Interiors?" It would make more sense, I think.