Is the chase the bigger thrill or getting the photo?

I take scenic photos, but my main activity is bus photography. Having finally got to grips with taking a fast moving target I now take more ambitious photos. This usually involves chasing a specific bus, sometimes literally and getting in front of it. Other times just knowing when the bus will arrive at a specific time. However the minutes before it arrives are probably worse then getting the photo itself, will the sun go away, will a car appear, has it broken down, do I have the right angle to get the best shot, fidgeting, foot tapping as the time counts down. Is this normal, do any other photographers get these feelings?