Delis are quite often after staff because it takes such a long time for a staff member to learn all the products and procedures, and also how to multitask (which seems to be fairly exclusive to that department)
Having said that, things have changed a LOT in the last 12 years. I would mention that you have had previous experience, but I don't know how much of an edge it will give you.
To answer your original question, I know quite a few people who have left for a year or two then come back when they found the grass wasn't actually greener. As long as they didn't leave the company on bad terms, there were no problems re-employing them.
If you are going to go for a job, apply now as the stores will be picking up staff for summer and the Christmas season soon (and you know how busy the service deli gets at Christmas!)