My best presentation at university was during a small seminar. It was a 45min talk about 3 papers and how they relate to each other. I procrastinate a lot, so I didn't really do anything besides reading those papers until the day before my presentation. That day, a friend called for a spontaneous barbecue, so I had just an odd hour to actually prepare slides. I managed 8 slides in total, the rest I just impromptu recalled from memory. People liked it and it was the least effort I put in any talk I held at university.
Honestly, that's the right way to do it if you really know your stuff.
The slides are there as a visual aid or backdrop. The "presenter notes" is where all your bulleted items and prompts for recollection go.
Also, and this is where a lot of people get it wrong, the slide deck is NOT a useful document for distribution. It is specific to both the subject matter and speaker; it's analogous to sheet music. A video of the presentation (e.g. TED) is far more useful as we're really talking about a performance. At worst, there should be "references" page in some appendix, with hyperlinks to actual media that folks can digest on their own time.
The best presentations are about topics you know well enough to discuss at length, and aren't constrained by paragraphs of points you need to get through. And a presentation is the best way to explain a graph or diagram.