As with so many things like this, the answer is "it depends" (on so many factors). OK, and several of the countries you mention aren't "English speaking."
As far as "easy" for immigration purposes, you have to figure in not only whether or not you speak the local language, but do you have any contacts in the target country - family, friends, business associates or colleagues? Will you require finding a job? And if so, what qualifications and experience do you have? Are you qualified in an area where there are shortages of available workers? (And in EU/EEC countries - Spain, Denmark, Ireland, Switzerland and Austria, from your list - you'll be competing against anyone from the rest of the EU/EEC who already has work authorization throughout the EU.)
In very general terms, the "easiest" way to move to a different country is to find a job there, and let your employer handle the bulk of the immigration paperwork. That also gives you a point of contact within the country to assist with things like finding housing, getting you enrolled in the various tax and social insurance plans and helping you get yourself established. If you won't be working, then for most places, you'll need to have a pension (say, for retirement) coming in or significant investments you can live off of.
You may want to consider doing some travel to get a look at some of these places before you try to figure out how to move there.