I work in a similar way...mixing it when necessary or even when I feel like a bit of a workout. Sometimes, I get so far ahead of my mate who is tradding the bottoms, that I get a bit bored and go back and join him on trad.
I have a 80ft hosereel in my van and I don`t have any set up delays...I literally pull up, get the pole out, connect up, turn on and I am away. The street I was on today involves poling all the top windows (3 bed semis), but the sun shines right onto the front of the houses so on a hot day, I have to do them trad as it takes too much time rinsing in the sun and the finish is never to my satisfaction. I am just as quick on these days and it is a refreshing change to work a little bit harder.
Its an expensive tool to have but it is what I consider it...a tool in the van
best of luck