I have a son almost 12 and a new baby who is 8 months. It is SO MUCH easier with the 12 yr old, he is independant, doesnt need to be watched all the time, can basically take care of himself. We're more friends than anything. The baby is now in that crawling and getting into stuff and needing to be watched every second stage and i'm finding it very frustrating, now i'm having flashbacks to what it was like for years with my older son, and i'm kind of like "oh crap what have i gotten into!"

That being said, in some ways i agree with the "its not easier just different", in an older child there is a different clash of wills, the toddler might insist on climbing on top of the tv or running into a parking lot...but a teen's insistence on their independance manifests itself differently. Some people also just have certain ages they are "better" with.
But i think mostly it has to do with experience, as someone else mentioned. i kind of laugh to myself (sorry!) when i read posts about people freaking out because someone gave their kid a lick of ice cream or bought them a certain toy, i think once you've been parenting for a number of years you know in the grand scheme of things that stuff isnt *that* critical.
I think the biggest difference for me, in my parenting over the years, is that when my son was a baby i was so sure that my way was the right way and pretty critical of other choices, and now i'm a little more open to people doing things differently from me.
It might also be a case, too, of parents---when their kids are older--not hanging on parenting forums so much, but spending their online time on other areas of interest. I know for me, i spend alot of time in adoption forums (youngest babe is in process of being adopted) but once i've adopted and a few years have past, i may not spend so much time discussing adoption issues.
Katherine