If your talk is about, say, heat engines, and you want to have an animated Carnot cycle or something, great! Do that! That sounds useful! (These days it would probably be implemented as a video, which is why my brain binned it as such, but it really could be done with PowerPoint alone.)

If you want to have your slide chug in from the right "like a locomotive" then have each item on the screen individually fade in "like puffs of steam" then once you're done the whole thing drifts to the top "like smoke" because "steam engines are heat engines", that is the crap I am telling people to get rid of.