External monitor usage w/ rMBP

Hey guys and gals!

Until a month ago I used to hook my mid 2009 Mbp 13'' to my 24'' BenQ external monitor. I recently purchased a refurbished Feb 2013 Retina Macbook Pro 15'' and sold my old one. Ever since first looking at that beautiful crystal sharp screen I find it hard to use the external monitor at all. (I basically force myself to using it)
It is a great monitor and I'm quite happy with it but I consider selling it now.

I just wonder if anyone else on this forum feels the same about this?
Even for work-related tasks like print- and mediadesign or editing I do not want to use my external monitor anymore. Don't use it for gaming anymore either.

I would appreciate to hear your opinions my friends

Hank