These differences are interesting, but what I had really wanted was just to play the original vanilla final level.
Also, if I pump 3 (or even 5+) rockets into the hole, it doesn't seem to bring the boss monster down. However, in gzdoom, the position of the top of the platform seems lower. You had to fire just before it got to the top and it took about 3 rockets to beat it. I distinctly remember in the original, when the rising platform was at the top, the aim was too high to enter the opening in the head. So, I tried loading up gzdoom without BD and skipped to the final level. They have made the final boss much more active, shooting fireballs, and given it 40,000 hit points (I posted a couple of screenshots here).
I've reached the final boss however, in BD they seem to have changed the Icon of Sin level significantly. I've been playing through Doom 2 using Brutal Doom in gzdoom.
