I've decided I'm fed up with the standard Powerpoint-esque slide decks and want to instead produce slides for my math talks that look like what I might produce giving a "chalk talk". In particular, I'm imagining much more dense text, probably in two columns given the aspect ratio of projectors nowadays, a much smaller font, but also slides staying up much longer than is typical of slides produced in the Powerpoint style.
I almost have exactly what I want simply using the amsart documentclass, two columns, and some geometry package magic to make the page the same size as in Beamer and to get rid of headers/footers/etc. In particular, a massive improvement over using, say the beamer column mechanism is that I don't need to solve the problem of laying out the text across slides or even within. I get to introduce theorems, definitions, examples, equations, etc., and latex naturally handles the problem of splitting up this all into discrete slides because the slides are actually just pages.
What I have lost, though, is the ability to do overlays/build-ins. It's very daunting to the modern audience to be faced, all of a sudden, with a large, dense, screen of text. I feel what I need, at a minimum, is something akin to the \pause functionality in beamer. I'd be perfectly willing to be forced to introduce \marks to tell such a \pause function where to "rewind", although I'd like something as light weight as possible.
I've started reading up on TeX but I have nowhere near the ninja skills to pull this off. Any ideas out there for how to get started?