Uh, No, I most certainly am not.
While you might be quoting what people have said, I think you certainly are misunderstanding their intent behind saying those things.
Let's face it, as life progresses and responsibilities increase, most of us don't have the same amount of time to spend prepping and running a game. While 3.x might have worked fine for a high school or college student who has lots of free time, for someone holding down a full-time job, and maybe with family responsibilities, preparing a system-intense/heavy game might not be feasible. A lot of people apparently thought this way, and gave feedback to WotC that they wanted a game that was easier to prepare and run, while still offering pretty much the same in-game experience. WotC listened, and we got 4e. While 4e is easier to prep and more intuitive to run, it certainly isn't a dumbed-down or t-ball version of D&D. As a happy side-effect, it is also more friendly to new DMs, and thats a wonderful thing! 4e also allows experienced DMs to do ANYTHING they could in previous editions, with much less hassle. Its a win/win situation for all DMs.
And speaking from a personal standpoint, when you make the claim that 4e is "dumbed-down" and "t-ball" D&D, it is insulting, only serving to further the edition war. While I'm sure you're a fine man, it makes you look like an elitist jerk online (and being elitist over a game is about the silliest thing I can imagine). I realize some of what you are stating might be hyperbole, but seeing the same thing over and over is annoying.
I ran a 3.x campaign up to 18th level, and played 3.x from 2000 until around 2004. During that time I was in grad school for my PhD in Neuroscience, and my MD in Neurology. And let me tell you, preparing a 3.x game while juggling research in lab, studying for classes, my teaching duties, and residency was a royal pain in the ass. So much so that we quit 3.x in 2004 (we also quit due to player frustration with the system), and went to Savage Worlds as our go-to system until WHFRP2 and 4e came out.
When you insinuate I cannot handle prepping a 3.x game while I am able to do computational neuronal network modeling, neuroelectrophysiology, neurobiochemistry, and neurology is laughable and absurd. 3.x, while a fine system for some folks, is not the be-all and end-all system, and doesn't provide everyone with what they want. For me, the effort that went into prepping 3.x simply wasn't worth the work, especially with my other life responsibilities. 4e is much more in line with what I want when I prepare a game, gives me more bang for my buck (in a time invested manner), and while it isn't perfect, 4e allows me to run more freeform type games that I enjoy more as a DM. I run 4e games in EXACTLY the same way I ran 1e/2e games- with lots of plot, character development, and roleplaying, with S&S/horror/suspence/investigation based slant. At this point, there is no way I'd ever go back to prepping or running a 3.x game, and very likely wouldn't play one anymore- not because I am incapable of doing it, but because the time investment is too great for the small payoff, and I just don't find the system a good fit for my gaming style.