Question: if you have used such softwares to make experiments, what
did you think about the process?
We use Paradigm (www.paradigmexperiments.com) in our lab and like it quite a bit. You can build most experiments just with the drag and drop builder interface. It also supports Python scripting just to give you more flexibility (and piece of mind in case you're trying to do something the builder doesn't support). In general it's pretty easy, the company that makes it has been great with support when we have run into difficulty but by and large our students are able to figure it out.
...seem to suggest researchers or professors don't mind learning a little
bit of coding to make experiments.
Right now almost all of the experiment presentation programs that work on OS X are scripting-based (e.g. Python) so I think that's why you're getting that impression. From my own experience it's not true. Most new RAs and grad students are pretty unhappy when they are told they have to learn Python before they can even start doing any research.
Also, do you think there are many people who would want a new software
that does everything but without coding?
I think it would be very difficult to build new software that did not use scripting at all. The nature of research is that everyone is trying to do something no one has done before, so you really need to have a way for people to extend the software's functionality without waiting for the next version otherwise no one is going to use it. Having said that, Superlab (www.cedrus.com) has attempted to do it but with, what I feel, are mixed results.