My main love is mountain walking/scrambling/climbing but I cycle to keep up my fitness levels between walks plus I can do it from my front door several times a week whilst fitting it around the rest of my life.
I used to mountain bike a lot which is a lot more fun than road biking tbh - but less convenient for me these days.
I do enjoy my road cycling most of the time. When it is cold and windy it can be a chore and whilst I'm pretty confident I could cycle much further I get totally fed up after an hour and a half or so.
On the upside there are times when its a nice calm day, I crack off a couple of good hard hills whilst enjoying the lovely countryside and I think that as a simple, easy to get into sport it is hard to beat.
The trick is (I think) to establish a regular routine to your cycling - whatever suits you really. I aim for 2-3 times a week totaling 40-50 miles whereas others do that distance and more day after day! Whatever works for you really.