Yeah, I've started playing again too after seeing the LP threads. My own stories/observations-
I love the AC/HE combo beyond reason, and continue fielding it even when I have heavy plasmas. Blowing away cover is a job for replenishable ammo. The weird part is, the longer the game goes, the HE rounds seem to be getting less effective. Not to the aliens, I know how that would work. I mean to the terrain. I could swear my AC/HE guys are having a harder time blowing down walls that they used to.
On Savescumming - the game is already barely challenging on superhuman, why take that away from it? Besides, you have to exit combat to load a game, so I find savescumming makes the game take way too long. I still save before every battle and periodically when at peace, so I don't have to make up lost time if something weird happens. I do reload the game if, say, a base-building replan goes wrong, or I lose a couple Captains on the first turn of a battle, and other such things I'd have a hard time recovering from.
Nobody has mentioned it yet, so here's my base building strategy - aliens home in on your activity, and while I've never lost a base invasion, I've never palyed very long on Superhuman either. A strategy I'm trying now is building a separate base in the Falkland Islands to house all my scientists and engineering, while a ring of combat stations in Romania, Taiwan, and Louisiana protect the real world.
Finally, I must regale you all with the story of an incredible rookie. Some of you have probably heard the legend of Squaddie Patrick Stewart - I've found his reincarnation. I took a rookie on a terror mission, armed with a laser rifle. Every. Single. Turn. I told him to fire an autoshot at a sectoid outside of his own visual range. Every. Single. Turn. he killed at least one alien, sometimes more. He was taking down cyberdisks and shaking off plasma fire, all with rather mediocre stats. Every mission since, he's been called on to do the same, and has delivered, without fail, every time. He's got like 12 kills after 5 missions, and just won't take damage. The best part? His randomly generated name - Rudi.
Ru-di! Ru-di! Ru-di!