You mean starcraft? Starcrat is unbalanced, which leads to 'spamming' keys. Supreme commander is the continuation of Total Annihilation, and it plays a bit differently. It's a lot less twitchy and lot more strategic imo, but that's not to say it doesn't have it's flaws.
Sup Com/ Sup Com FA allow you to pre-plan through templates, this helps you focus on whats going on rather than having to balance running defences/offences with building resources. You can just place the templates down and get to it.
Yeah, I'm not a fan of spamming keys at all. Pre-plan templates sound good.
If you like medieval games then I'm sure would love to play Mount and blade if you haven't already. Mount And Blade: Warband is my favorite which I would recommend anyone who likes the traditional RPG and medieval game. If you enjoy history then you could further the experience by installing a few mods which just makes the game feel like a real simulator.
Other than my suggestion, I would recommend getting Morrowind and Skyrim.
Actually yeah I played the demo of that a while ago and I really liked it. Thanks for reminding me about that game. I'll add it to my list of games to play.