Same. I grew bored with WW2. Loved the series on Genghis Khan and WW1.
Do podcasters have a script that they work off of? Just notes that they ad lib from? The Mike Duncan Revolutions podcast seems like he is following a script pretty closely but with HH, I have this idea that he is at his desk just randomly picking up books and reading passages out of them and then riffing his thought on it.
Mike absolutely has a script. If you want another great podcast, by him and what broke him onto the scene, it's his The History of Rome podcast (I actually relistened again for like the 10th time over December.) In that podcast, specifically his 100th episode question blowout, he kinda goes through his process, but to make it short, yes, he writes everything down and follows it. I have heard him even flip pages sometimes in some of those THOR episodes.
If you do get into that podcast, which is really, really great, and really another big thing for him the decline and fall of the republic, (he has a book out on it), just know that like, the first 10-ish episodes are very short (like 12 minutes) and very rough, he even kinda talks about it in the podcast, but he just kinda started doing it, didn't think it was going to ever get as popular as it did, so he had to update his server/hosting site, audio, etc. I think he even admits in an episode "I was literally learning what to do as I went along"
I will admit compared to other podcasts I've heard, I really, really like that most Mike's episodes are in the 20-35 minute range. Dan Carlin's stuff is so long it's almost daunting to see how long they are. Having the breaks make it more like a compact story and lecture instead of a long drawn out talk.