I've been to Everest Base Camp, actually the mountain above it directly accross from Mt Everest... It's called Kala Pattar and where the classic photos of My Everest are taken. It's a 3 week trek up and about 5 days down... Boy oh boy after the first half hour going down you can stride it out like a super hereo.
The adventure tourism climbs of Mt Everest have become extremely prevalent now because they can be done in a short time for a cost that makes the climbing companies millions but is still cheap compared to cruising. I think it's about $30,000 for the whole adventure per person, so about one years cruising on the average boat, two years on a budget boat, so in any way it's cheaper than circumnavigating in time and money and you don't have to buy the damn boat!
The climbing companies have found a "formulae" to do it, as perhaps World ARC has done too.
Remember also, Mt Everest up the normal way is NOT a climb. It's regarded as a trek by mountaineers. The difficult faces of Everest are not the ones the "tourists" do. And really they are not tourists as they may have been super fit out doorsy mountain climber types their whole lives. It's not like Aunty Gwendolyn and Uncle Cecil are staking their flag on the summit of Everest.
As an adventure the Base Camp track I did was hard enough for mere mortals.... The group of 10 were all 35 or younger and only 4 of us made it to the top of Kala Pattar. Fortunately I have the photo to prove it
Compared with cruising its very similar in some ways... No matter how many tourists on the mountain, or at sea, its still Man and Nature. Not against nature... You can't do that here nor there...
Killarney Sailor, it means when you have finished your circumnavigation you will both have a nice little warm glow inside. There's not many people who have done it. It is a challange of the most adventurous undertaking.... It just doesn't feel like it because we love cruising.