As you can see, there are quite a few opinions on software here as well as any other site that discusses Cad or Cad/Cam software. If you never have used any Cad software, then there is going to be a learning curve you will have to go through. Everyone has a different approach on how to solve a problem, that's just human nature. It's that difference that makes people prefer one thing over another, including software.
Since you have been modeling over 65 years says you have been around the block more than a few times, like a lot of us here. A question you need to ask yourself is how many more times you can make it around that block. In other words, how many laps are you willing to give up learning a Cad Program? I am not trying to be facetious here, I am just trying to make the point that you want to keep that learning curve at a minimum. A lot, if not most 2D Cad programs work similarly to AutoCad. If you can sketch something out on a bar napkin and your buddy can understand it, then the 2D program won't take long to figure out. It will draw a straighter line and rounder circles than you can though.
3D in my opinion is horse of a different color. The learning curve is much steeper and the interface between the software and the user can be frustrating. I believe most all Cad products have a user group where you can ask for help, as well as here on this site. They say a picture is worth a thousand words, but a video is so much more. Vendors should offer instructional videos on their site or have them available on YouTube. You Tube can be your friend when trying to learn something, just don't pay attention to the influencers that try to compare Cad A to Cad B.
There has been some good advice given by others here, along with several capable Cad programs. Check out their websites for the programs mentioned and take advantage of the 30-day free trials. At some point you are going to have to put your toes in the water.