Yes, I have been doing design and analysis with CAD and spreadsheets. TORUS could be a real time saver, though. But, it has quite a steep price.
I was more curious about stability etc. Many Autocad add-ins can be prone to crashing. We have used Autoturn for quite a while, but we have an older version. It used to be stable, but for some reason is crashing frequently lately (and is only usable on an older version of Autocad).