No, I'm not an expat at all, still 100% Dutch and as I left my house and work 9 years ago, I really am outside the system here.
However I have loads of work as a gardener and handyman amongst other jobs and live with friends.
I visited Ireland for 3 months back in 2011 at my family though and worked in an animal shelter while I was there.
My ID cards were still valid back then of course and I had no trouble crossing the border, even though I sweated a bit on my return as I had alot of debts from my house that I left.
The issue currently is the Brexit, which will make travel