but when I was heavily involved in cycling I had my bicycle with me everywhere and there seemed no reason to walk at all. It felt so slow!
Exactly. I even like cycling for a small errand that's a 20 minute walk away. And then I often end up cycling a little bit more afterwards.

My body gets addicted to cycling..or maybe it's my brain/perception gets addicted with cycling as 'faster'.

But also where I live, it's just more pleasant to cycle ...in my opinion. Well, actually come to think of it, I've had this mind frame for all 3 major cities where I've lived where services are not too far away from me.

For instance, living in Ontario..I just found it less hot, humid/awful in the summer, if it was 30 degrees C and humid, to cycle to the store that was a 15 min. walk away instead of walking under the blazing sun and have cars swirl by me. I know about weight bearing benefits, but really I had zero interest in lugging home groceries under those weather conditions.