Personally, I'd prefer to give a 1 hour presentation of my work over a full day of technical interviews one after the other. I like this presentation idea - I've only ever seen it done when hiring people with PhDs just out of academia, but I'd like to see it as an option for non-PhD positions as well. This way you get all of the interested parties in the room at one time, they hear your presentation and there's some Q&A afterward and you'd be done in like 90 minutes to 2 hours.

If this became standard practice interviewees would create a presentation once and then adapt it for each company. So sure, you'd put in a dozen hours or so the first time but then for future presentations it would take much less time to tweak it for the intended audience.