A few years ago, when I started my first full-time academic post, I had to take a "how to teach" course as a contractual obligation. Not just a one- or two-day training session, oh no. This was a several-hours-a-week ongoing Enormous Waste of Time that led to an entirely superfluous qualification that currently lurks in the dustpile near the end of my CV.
Sample session: "How to Lecture to Large Groups Effectively", where 5 minutes of material was stretched out to two hours of powerpoint slides (plain b&w: don't use colours in case you disadvantage students with colour vision or reading disabilities) read out (with little elaboration: don't use culturally-specific anecdotes or examples in case you disadvantage international students) at a steady pace (slowly: don't speak too fast in case you disadvantage non-native speakers of English and/or students with reading disabilities). Every couple of bullet points was interrupted with a check that we understood everything so far (we were a class of academics and this material was delivered at a level a 12-year-old could follow: eventually someone asked her if it would be possible to move more quickly), and every few slides was interspersed with token group exercises where we had to reflect on what we'd learned so far (not a lot - there was very little content in all the handwaving).
By the end of the session, when it was clear that we had filled our requisite flipchart pages, the instructor was practically hugging herself with glee that she had imparted her message so effectively. By the end of the session, I had practically ground my teeth down to the dentine. It was a perfect lesson in how not to teach: the visuals were dull, the delivery was monotonous, the "interactive" exercises were simplistic and redundant, and the pace was so slow that the entire class became intensely frustrated.
Ironically, those dreadful "how to teach" sessions probably have sculpted my lecturing style. Whether it's fair or not, they made me decide that it's worse to alienate the top of the class through boredom and frustration by pitching the delivery at the weakest students than it is to alienate the bottom of the class through incomprehension by pitching the delivery at the best students. In other words, if I must lose students during my lectures, I'd rather lose the dim than the bright.
Ouch. Not very caring and sharing, is it?
Now, I pitch the class at the upper-to-middle (students at the 1st class to 2:1 level). I distribute lecture notes online in advance of the class and make it clear that I'll assume that students have the notes in front of them during the lecture. The pace seems to suit the majority, or at least I get no indication otherwise. If any students have trouble keeping up, they also keep very quiet about it. Or maybe they just bring the notes and pay attention next time.
And yes, I use colour on my slides, frequently ramble off-piste with whatever relevant anecdotes come to mind, and speak in my natural style that happens to be fairly rapid. And my teaching evaluations come back positive with nary a cross word about level or pace.
Am I just very lucky and keep getting classes of students with reasonable attitudes and expectations? Or does my refusal to cater for the bottom of the class actually work out best for the class as a whole?
Either way, if it ain't broke...

