I do use Procore for document management, but I have not used their estimating program. I think that what trade you are estimating for would have a huge impact on how good it is.
I happen to estimate Mechanical (Pipe & Duct) and Plumbing. I use Autobid Mechanical and Autobid Sheetmetal for estimating (I think it is now owned by Trimble now). Its a pretty well thought out system that is specific to the trades I estimate for.
for Architectural trades, Procore may work just fine. You can certainly pull dimensions to scale and find area measurements pretty easily. I do a lot of detailing for my field personnel with it. I'm actually doing that right now, or at least I should be (but I'm on the Hide instead, lol). I put the dimension lines on the Mechanical Plans to make it easier to set equipment for my guys, my foreman do not have to scale everything and spend a bunch of time in the field that I would rather use productively installing stuff.