As someone who is in the beginning of their Thoth experience, I can say that even with only these few weeks of study under my belt, I'm already seeing things differently.
The first time I casually flipped through Liber 777 (or the Book of the Law, or even the Book of Thoth itself), I was bowled over by the sheer amount of things I didn't "get". It was like reading a language that you've never heard of. But, slowly, as I read and dug in deeper (and as the wonderful people here help newbies like me by explaining in small, easy-to-understand words), I find myself understanding the basics and wanting to know more.
Taking up the Thoth makes me feel like I'm playing connect-the-dots, but the more dots I connect, the bigger the picture gets. And I like that about this study. I like that once I understand how a certain facet applies, there's always more to be learned, always another layer. I like that there's a well-rounded and well thought out system. And I like to take a step back every few days and let my mind catch its breath and go over what I've learned, and how to apply it.
Basically, this is the most fun I've had in a while. That may not be spiritual or enlightening or anything, but that's my experience so far.