I've used Visio professionally for fifteen years to create schematics. There are lots of programs to create them, as well as simultaneously building PCBs or logic testing circuits as they're designed, but for all-around ease of use and interchange between Word and PowerPoint, Visio is hard to beat when all that's required is a schematic.
I once worked in a place as a consultant where the principle engineers were delivering schematics in different formats. It looked like multiple companies were designing the electronics on the same floor. As the end user, I sat everyone down and told them we weren't leaving the room until we standardized the documentation. Every drawing had a different look and it was driving me nuts.
Based on my recommendation, (I wasn't a Visio user then) Viso beat AutoCAD -which was used by one guy who had been around forever and wasn't about to change "his way". AutoCAD was total overkill for a 2D environment - trying to get revisions out of him was like pulling teeth. The AutoCAD designer went ape$h!t and walked out the door that day. He was as hooked on complexity as I was on simplicity. After that, all of our docs had a common "look" to them and once I subsequently learned Visio, was able to make changes on the spot.
TI has a common look to their documentation, which make learning the circuity and troubleshooting much easier. Most large companies have a standardized format designers and tech writers are required to adhere to. Visio can't do everything, but there are circumstances where it works very well and is affordable for the average home user. Best of all, it's very easy to learn with a workflow that has commonality with other Microsoft apps.
Edited by CC Clarke, Sun Dec 25, 2016 2:39 PM.