However, if I don't have platemail, or electrum pieces, or teleportation, or whatever in my campaign world, then who cares? That's not being lazy. Some things in the core rules would create a campaign culture that doesn't fit with the DMs vision of the world. I don't want continual flames dancing on every wooden post of every street corner of my "medieval" towns and I don't follow the reasoning of people who say that I _have_ to have it there or else I'm being lazy.
No one is saying "run a game in which you don't have fun." Mostly what's being said is "what's worng with having fun within the rules as they exist now?"
I mean, I do drop house rules on PC's, and I do admit that some of those are just me being lazy and not wanting to deal with certain campaign issues that occur naturally in D&D. I'm not about to go around saying that Teleport is a problem because I like to nerf it, though. The spell isn't at fault -- I am, as a DM. And y'know, every DM has their own quirks. Nerfing some effects just because I don't want to deal with them is just one of mine (and one of many's). This doesn't mean that what I nerf is bad, just that I don't have as much fun.
In a sense, you are being lazy, just like I am. But if you and your players are having fun, who cares how lazy it is? I'm the first to admit that I don't want to invest hard work in having fun. I invest hard work in what I HAVE to do, not what I like to do.
LOL, this is a fun little game, but in all seriousness, the big difference is that there are implicit and explicit countermeasures against the aforementioned player options. Charging has restrictions on it specifically to prevent it from being in some instances. In certain terrain, you may go an entire adventure without a chance to charge. Players know that, and should revel when they get the opportunity (on or off a mount) rather than expect a charge whenever they want one. There's not much in the way of explicitly clear countermeasures for teleport that have any long-term weight. That's what I was hoping for.
Well, if a DM always had scenarios wherein the PC's couldn't charge just because he didn't want the PC's to charge, that would be lazy DMing, especially if one of the players maybe played a mounted, lance-focused character. As a DM, part of your job is to make your players happy, and if you're constantly on uneven terrain when you have a charge-focused character, you're not making your players happy (probably).
Not that being lazy, again, is an especially negative thing. If you don't want to deal with charging and the PC's don't mind not charging, then you can play without charging and be happy. But that doesn't mean that charging is flawed.
Similarly, Teleport isn't flawed just because some DM's don't like to deal with it. I don't like beign able to Plane Shift whenever you want, so I nerf it. Because I'm lazy, and I find being able to plane shift only in certain circumstances adds to the dimension of my world. So I nerf it. That doesn't make plane shift flawed in any way, it just means that my needs are different.