If the opportunity is avaliable, it's better to do a longer trip to point A and travel to point B by public transport than visit multiple places in seperate holidays.
I did a few multi-country traveling holidays and a multi-month trip in my 20s. I managed to travel from Germany to Beijing by train, and at least only had the one long haul flight back which was better than a return long haul flight.
There's nothing quite like spending a few months living out of a rucksack to curtail consumerism either. I'd have consumed a lot more resources in the few months at home and my car was off the road during that time.
I'm glad I did that in my 20s, the experiences were incredible. It's not been viable in my 30s-40s due to raising a family and while I hope to see more of the world again, the 50s+ are more risky in terms of health and opportunities. It's also less likely that you'll have the stamina for staying in basic hostels and managing with public transport (I hope I do though, although my back is less forgiving about crap beds than 20 years ago!)