I'm sold, but I'm also someone who rides about 10 hours per week, putting over 5K miles on my bikes per year. I started biking because I was trying to lose weight, and my daily jogging overstressed a tendon in my foot, forcing me out of that exercise for a while. At this point, I just really enjoy riding bikes. I do a mix of on and off road riding, depending on my mood.
One thing that is really nice is how cheap it is to get into it. You don't need the latest, greatest $5K bike to have fun. I have a mid 90s vintage Trek mountain bike that I paid $45 for, and it was practically new, with the only wear and tear being from kicking around a garage for 30 years. 90s mountain bikes make great city bikes, because they typically have 3x7 gearing that will give you a low enough gear to climb any hill. They're really durable, and were also cranked out by the millions, so it's super easy to find them cheap.