I love the EQ7 software. I bought it because it offered the ability to scan fabrics in my stash and plug them into a block or quilt setting. If you are willing to spend some time with the manual to learn how the software works, I think you will be amazed at what it can do and how it can enhance your own personal quilting experience. The manual is well written and illustrated, which is why I was able to stick with it and work through it.
EQ does do the math for you, but it helps that you've done your own computations because you may not always want to cut your patches or borders the way EQ recommends. I always study the fabric yardages and cutting diagrams, sometimes following them to the letter, other times going my own way. Regardless, it's nice that the software gives you a starting point.
I recently purchased a series of books published by EQ to really dive deeply into the drawing features offered in the software: Pieced Drawing, Applique Drawing and Quilt Design. I'm enjoying my self-imposed homework so much, I've written about my progress in my blog.
Quilt software isn't for everyone, but if you are already drafting your own blocks and creating your own layouts, you may find that EQ will speed the process.
Good luck, whatever way you decide to go.