Ah I'm super jealous. Interesting question. I only did it for 10 months 2009-10 and then was broke and had to make the decision to go home and I still wish I had of just kept going and worked something out, I gave up too easily probably.
As people have stated here, I know it's not possible for everyone to take time out of their lives nor do they want to, BUT it is something people can and do, do. Long-term travel can be feasible if you don't travel extravagantly and like it was said above, if you have a job online or can pick up some cash.
I was primarily in Europe so I stretched my funds well but could have stretched it further and not done some things. But my little stint was my best year of my life to date. I love the lifestyle of no obligations and moving around on a whim. It would take a long time to bore of it, and I think the longer you go the easier it is. I think living out of a backpack and using a terrible travel towel is just how it is after a certain point. You talk to so many people who do their trips and love it but at the end are happy to go home and use coat hangers again and I find it quite interesting, I am yet to go anywhere and not board my flight home kicking and screaming
There's still time, I think apart from the brief interludes of working and being boring in attempt to get my shit together which are always short-lived hopefully my life is going to be one constant long-term travelling experience.
i been travelling for few years now...well since 2003. right now in indonesia.
I'm a bit jealous, too. I'd love to travel for a longer period of time!
I traveled for over half a year a few years ago, and after my budget declined ended up coming to live in Munich (I'm from Canada). I've lived here ever since, so about three years now. It's become a home now, I guess, in a way. But really getting to know the culture here is also a sort of travel, I think, even though I started living here stationary (in one city, not all over). I got to know the areas around where I am, the different sort of people and their way of life, how it is to live that life. That wouldn't have been possible if I stayed for three days, or even a week.
Although I want to go on a longer world trip as soon as possible - but raising money isn't so easy at the moment! Though since I've come here.. Germany, Italy, Austria, Croatia, Serbia, Australia, Canada (naturally), and Vietnam in a couple of months...not bad
I would love to take two years to constantly travel. As mentioned above, money is the key factor. My plan is to trade the stockmarket and generate an income. I am currently generating roughly $600 a month (consistently) and need to get it to above $1000 a month for me to be able to quit work and start traveling fulltime. I know a few people doing this too and it is great because you only need to put in a few hours a month and can work from anywhere. I will have to bring my laptop but that is about it.