Your pretty much right wrott. If you move everything over from an old system to a new system with out a lot of stress on the animals, which could greatly increase ammonia, then there is enough micro..stuff to handle little ammonia increases. You really have to have a good clean system first though, if levels are kind of funky to begin with the move would just make things a million times worse.
Some.. idiot at the LFS once told me cycling was stupid and you never needed to do it. He however had set up a 30 gallon tank with water and live rock from the stores displays tank, which at the time was extremely healthy.
If you add a lot of new live rock even if it's "cured" it can also cause serious problems. Though it may be safe to add to a large stable system a dramatic change like that could be very bad.
Almost everything is better when it's slow and subtle. If you move a tank into another of the same size and move absolutely everything safely, then all the changes is your walls. Just remember what cycling is all about, getting enough micro bacteria and organisms that can break down ammonia, nitrite and nitrate. (cycle-Nitrogen cycle)
Jon