Personally, I found it more boring when there was refueling. As others have said, too many teams would attempt to leap frog rather than pass on the track.
This is a fallacy, and always was. If it was true we’d have seen much more passing in the last part of the race, when all the pit stops had been completed. But we never did – because the presence of absence of refuelling never made any difference on whether drivers wanted to overtake; it was all down to the aerodynamics making it too difficult to pass. Still is, of course.
As ever, I’d like to see more freedom in the regulations. Let the teams build a fuel tank that would require them refuel during the race if they want to, or one that can go the whole race on a single tank. It’d be interesting to see how different solutions and strategies played out over the course of a race.
It’s also worth noting that refuelling was actually banned on cost grounds, not because of any imagined improvement to the racing it might bring.