I read "depending on use" as a modifier to 2-3 years not on every. That is to say the cable will break sometime between 2-3 years with heavy use being sooner rather than later.
That's what I meant yes. Although I guess if you are really careful it would probably last longer. However the heat from the adapter (and the magsafe plug) will slowly degrade the rubber and glue.
The one I'm currently using is 6 years old. My boss had to replace his within a couple years and they showed him how to properly wrap the cable. He taught us and it's been fine.