Bobso2 I believe the only reason he was giving algorithms was so that he could let the viewer follow along just in case he went too fast or something of that nature. The way he solves all these cases except the last one are VERY intuitive, in my opinion.
Here are some of my edits per say. Your 1B, if you R' U2 R, then RUR', then you can keep it flowing and do a R'U2R'UR'
With case 1C, I took a specific minute to look at these on my own one day as I was having some issues figuring out which way to turn that edge piece to correctly pair w/the corner. Instead of looking at the side (since a lot of times it's not on the correct fact), I compare the edge's sticker on the U face with the corner sticker on the F face (I don't need to put the corner in LFU/RFU anymore, but to help get the drift that's how I explain it). And if the U and F stickers match, turn the edge AWAY from the corner. If they don't match each other, turn it TOWARD the corner.
In case 2B, when you remove that pair, since they are conveniently placed, you can actually also keep that one flowing. Instead of doing R U' R', then a cube rotation, and then L' U L, I like to do R U' R2 U R. I usually do the R2 as an R2' to make the twisting easier.
With 2D, you can actually use the RUR'U' trigger (three times) to execute this very quickly (especially when in the correct slot). I'll admit, I cheated with this one, as I looked the alg up, or maybe it was in badmephisto's tut. In your case showing 2D, you can actually RUR'U' twice, then U2, then L U L'.
I do your case 3B a little different, you might like it. It works out well if it's in the correct slot position. It's U2 R U2 R', that gets it setup, then you finish it off with U2 R U R'.
I noticed your last case, R2 U R2 U R2, was quite a shorcut. Is that one you cheated and looked up?
I also noticed you don't do a lot of insertions from the back of the cube. Was that just for this video, or do you not yet do a lot of those as a whole?
I'm not trying to bust you up at all, great vid, honestly

I was just giving my take on a few of these cases. Most of these cases are very common and seeing a different outlook on 3B is a bit nice for me to see since I'm so used to doing a handful of moves there (still executes fast it's just anything that can shave time is good, right?

).