Despite what many here seem to think, most of the prominent WCK Sifus have said that Wing Chun is based on principles and concepts. You can't simply copy your teacher's moves and expect to have success. You have to understand what he or she is doing and be able to apply it in multiple situations to really make any progress. This obviously is true for other martial arts as well, but not so much in some martial arts that I will not bother to name. So it seems to me that a little thought is involved in getting good at Wing Chun. We don't prance around imitating a Tiger, or a Crane, or a Praying Mantis. Wing Chun was designed to make use of human biomechanics. That seems pretty rational to me. Being a "thinking man" doesn't mean you have to be a Scientist, Doctor, or CPA. It just means you have to be able to analyze what you are learning and understand why we do what we do. People have blown this whole idea of the "thinking man's art" way out of proportion.
Does it appeal to more intelligent people? It depends on how it is presented, but I think so. When I've given people an overview or introduction to WCK and explained how triangles are used, ideas like attacking & defending simultaneously, not meeting force with force, using angles to best advantage, etc.....people with an eye to what makes good rational sense are impressed. The hot-head who only wants to learn how to bang....maybe not so much.
Being a "thinking man" doesn't mean one is expected to challenge and question every single thing that is taught. If you want an open-ended martial art where you can do anything you want go study JKD or MMA. Wing Chun has certain defining characteristics which makes it Wing Chun. We work within those parameters, just as a "thinking" military strategist will work within the parameters of the situation he is addressing. Being a "thinking man" doesn't mean you are a martial scientist trying to derive a brand new martial art every time you take the floor to spar.
As far as using this forum as an example...well, yeah....there is often very little "thought" displayed!
But then again, heated arguments about how things are done shows that the people involved ARE thinking about how they do their Wing Chun and how it should work. This is healthly. I don't do things today exactly as I originally learned them. I've made quite a few changes over the years based on discussing with others how they do things, trying it out for myself to see what works best, deciding they had a good idea about it, and being willing to make a change. Heck, I've even learned a thing or two from Hendrik!
But if there are those amongst you who want to say Wing Chun is not principle-based, doesn't require any thought to master, and only requires one to go out and "bang", then more power to ya! But I'll continue to follow the advice of men I respect such as Wong Shun Leung, Hawkins Cheung, Robert Chu, and Augustine Fong.