That's straight up-false. You're literally remembering Heroic SLabs as SLabs. Normal Slabs was never particularly hard. Heroic SLabs was about 30% as hard as people like you made out it was. How do I know? I was there, and I took people through it all the time, and they were like "How is this so easy?!" and I'm like "Because we're not playing like morons or trying to faceroll it". Heroic Shattered Halls wasn't anywhere near as hard as people made out, and literally became a joke if your tank was a Prot Pally.
I've never said anything of the sort, don't lie and put words in my mouth. It's pathetic. I said difficulty doesn't mean much to player experience when it's all pretty easy, and the actual design of the WotLK dungeons, normal and heroic, was far better than Cataclysm and TBC in the sense that it was ENJOYABLE to play in them.
Get a grip mate. Normal TBC was piss-easy. Heroic TBC required you to follow very specific strategies, and CC and pull well, but it absolutely was not hard, it just required not being a GOGOGOGO moron. Wipes did NOT happen regularly to the "best of groups" (incredibly rare and due to an unlucky fear or the like usually). They happened constantly to overgeared raider morons who thought that they were hot shit. At that point I'd been playing MMOs for what, nine years? But a lot of people, people like you, it was more like four or less. And people were amazed by like, basic common sense LOS pulls and stuff. And yeah I saw people in T4 play so incredibly fucking badly, or just expect things to magically work out for them, and it didn't, but that's because they were morons. But there were Heroics in TBC where you could play like a fucking moron, if you had the right gear and spec. Heroic Shattered Halls, for example, playing as a Prot Pally (after 2.3 or whenever it was), with decent gear, who could basically facepull large sections of the entire place. I find it hilarious that you think it's "flexing" on your arse to point out that they weren't terribly hard.
I will say this - I enjoyed TBC Heroics - in part because it was obvious that because I wasn't a GOGOGOGO moron, and wasn't a complete noob despite not wearing T4 or whatever, if I was leading or telling people what to do, they became pretty easy, and people were super-impressed and I got decent loot. But they weren't particularly enjoyable or involving in any other way. They got real old real fast because I just had to systematically tell people what to do.
And I notice you're dodging talking about the total shitshow that was Cataclysm dungeons. They were absolutely piss easy (certainly make TBC Heroics look hard by comparison), and just tedious as fuck. Also ugly as fucking sin - even ones that should have been amazing they managed to uglify. I've never been more bored and vaguely irritated than I was through Cataclysm Heroics. The CCing added nothing but tedium.