I've been watching lakorns and listening to Thai rock music constantly since 2002, which is one of the way I learned. I love both, and I don't love lakorns for their entertainment value per se but because there's always something to learn from them, fictitious as the plots may be.
I can also cook a wide range of Thai food, very well. Doing these things and acquiring these skills hasn't required living here constantly for the past 15 years (why would it?), and I'm very glad that I haven't.