after visiting just Lincolnshire I wouldn't say that "English countryside is dull and boring"
The mistake I made was assuming that because I have travelled across Poland (in a linear fashion) a couple of times along major roads, I could give some sort of opinion about what the countryside is like. Poland has flat bits, mountainy bits, boggy bits, woody bits, big farms, little farms and a variety of urban areas ranging from tiny to really quite big.
England has flat bits, hilly bits (you have to go to Wales or Scotland for mountains). It has big wide open places as flat as a pancake with endless fields and endless skies (like much of East Anglia, the East Midlands and so on). It also has little patchworks of woodlands and fields with little windy country lanes like you find in parts of the south. Then there are the wilder areas like the North York Moors, the Peak District, the Cheviots or Dartmoor. I believe someone has already mentioned some of our henges. You can't beat a good henge.
I happen to love the countryside, but having lived there as much as I have, it can be a boring place to live, especially if you can't get out. I like big cities, urban and industrial landscapes, modern architecture and old cobbled streets they forgot to tarmac over.
I have never seen a man on a bicycle leading a cow down the road on a leash in England.