Oh my goodness! I completed a raid in Cataclysm within 2 months of it's release in patch 4.3!
As someone who has not raided much, I have to say, it's rather amazing. I have so far gotten into two (2) LFR groups on my mage Rizzir. He's Arcane specced for PVE (though i'm considering switching back to fire - fire just seems more fun, as opposed to spamming 1 or 2 buttons like you usually do as an Arcane mage. I'd really prefer to raid as frost, but the DS just isn't there, even with all the upgrades that have gotten me to a gear level allowing entry into LFR raids.
The First time I did LFR I came in after the 2nd boss and the raid fell apart on the last boss at Malygos' old stomping grounds (I hated that fight the ONE time I did it on my main).
So, some thoughts after doing LFR twice. Yes, it definitely has a much 'easier' feel to it. No harsh mechanics that will wipe a riad for one persons mistake. I have to say, I get real confused with the massive amount of action going on onin a raid - trying to determine which things are good and what is bad (i.e. not standing in fire). LFR is pretty forgiving in this regard, and people explaining things helps a great deal, too. Not saying folks don;t explain things in regular raids, but what happens in LFR is muchmore forgiving for mistakes people make.
I have a 2nd toon tha tis ready for LFR now in addition to my mage. My old standby bank alt for 3 expansions, my rogue Snid. He's actually been around since Vanilla WoW. For some reason I never really got into playing him all that much and used him for storage and as a bank alt for the longest time. I even had his XP frozen at 19 for quite some time, up until it was apparent that twinking as we new it in Vanilla/BC was dead. He's actually made some of the fastest gains of XP and equipment of any of my toons. It helps too that he has maxed out enchanting and tailoring (I like the flying carpet!). He's good to go for LFR as either a Sub Rogue or Combat, as he has good gear for both specs and I seems to have a decent idea of how to play him relatively effectively.
I've gotten a bit bored with my Main toon, Eeo. I like him, but having finished Molten Front I've been kinda blah about playing him much lately - although getting that bad-ass axe from the Echo of Baine in End Time had really helped his PVE DPS. On a side note, I was thrilled to get that axe on my Alliance Dwarf Warrior Rogin on his first run thru End Time (just like Eeo!). Thank goodness for 377 PVP gear allowing me to qualify to get in there. Rather amazing how much his DPS jumped w=once he upgraded to a 378 Axe from an iLVL 316 blue mace!!
Now that I know I can get into raids and experience end game content, I'm happy to hav e achance to go back and go through older content with soe other toons. My Mage is getting Netherwing rep moving up, so maybe a mount is somewhere in his near future. I want to do that on my main as well. And since they're in Outland, I'll have more chances to max those other outland reps and just MAYBE get the rare mount from Anzu is Sethekk Halls.