Visiting Ireland for a week or two, or even a month, surely gives you a taste of the country as you race around seeing all the bucket list things in this amazing country, but there is no substitute for coming to live with us for 4 or 6 months.
Spending time in a single place for that length of time means you have a deeper experience, make deeper friendships, and get to know people and places that would never ever be open to you as a tourist.