While I see your point, and I admire your cheerful lugging, my point is slightly different. Part of the price for ABD calculates in the expense of logistical time and tips to porters for luggage handling. If we are in a place where this does not occur, fine. But in Iceland, we are still paying for that, and Disney is pocketing the overage. I'm sure it's only a tiny fraction of what they've built in to the overall expense, and obviously we wouldn't be doing these trips at all if money was an object, but it is a factor in comparing to other companies, who do not advertise seamless travel and do not charge for it either.
I can remember standing in the airport in Ecuador, watching a family with another tour company struggle with corralling their bags, while our ABD guides organized our group's bags onto dollies. Several times they sang out "This is the Disney Difference! This is why you go with us!" And they were right. If there's not a Disney Difference (whether luggage portage or anything else) in a particular country, then it makes sense to consider other companies when deciding on a travel experience.