A thing to keep in mind is that it was an explicit effort on Iceland's part to position itself as a prime tourist destination. After 2008 banking crisis they were in a severe bend and looked for ways out of it. Hence the push for the tourism. Then that volcano erupted. On one hand it all but killed nascent tourism flow, but on the other hand it actually broadcasted Iceland as a land of volcanoes and natural beauty. And the tourist tsunami started.
Be careful what you wish for I guess.
Tourism industry sucked in so many locals that there's now shortage of police force and doctors, because they pay less. But from the visitor's perspective the country now is as comfortable of the destination as it gets.
We did ~3000 km. Main roads are very good. The speed limit is 90kmh, which seems low, but go any faster and you will feel wind gusts starting to throw the car around. Gas stations are there when you need hen. As are hotels and restaurants. Many farms now have cafes or eateries, invariably with unlimited "soup buffets." Cards are universally accepted. In fact I have no idea how Icelandic money look like. Lots of tourists, but the crowd quickly thins out once you leave Reykjavik, or rather its center. Driving around the country side - there's very little traffic. More often than not we were alone on the road. However it's late October, maybe it's different in summer.
The country IS mind-boggingly beautiful. Saying this as someone who've been around the world. Insane scenery. Lava fields covered in moss, pitch black sand beaches, hot rivers that you can bathe in at -1c outside. Really different, invariably impressive.
You all should come ;)