I find that while I'm almost always the one DMing and rarely get a chance to be a player, I'm pretty okay with it. After DMing for so long (all through the 90s I don't think I got to play in more than 2 one-shots, because I was DMing the whole time) I find it harder to be a good player, as I tend to inadvertently site rules and step on the DM's toes, and metagame. That's just from the habits I've picked up as a DM. Examples:
"We should go after that large monster, he looks like an elite brute and will wreck our stuff if we don't take care of it" or "It doesn't look like there's enough monsters in this fight to fill out the XP budget so we'll likely have back-to-back encounters with no short rest. Everyone save your encounter powers..."
Stuff like that. I'm slowly breaking away from that, as I try to take a break to be a player every few months. Lair assaults are my best friend, as I can metagame all I want, AND be a player.