Having just returned from a fantastic couple of weeks exploring primarily by bus, I thoroughly recommend it. For anyone with a bit of stamina a wonderful, easy, and inexpensive way to travel to see more of the country.
From Fethiye to Goreme then onward to Adiyaman and Sanilurfa visiting the Heads at Nemrut and the mud beehive houses at Harran 12 miles from the Syrian border. It has just wetted my appetite to see more next time Diyarbakir, Mardin and Hatay and then there is the whole of the Black Sea Coast. So many places to see and so little time.