I like having a modest backlog of film awaiting the darkroom. It's existence reminds me that there are images I haven't even seen yet, and that I will have some happy surprises awaiting.
But there is such a thing as too much, at least for me. Exactly what that means is a personal decision. Whatever "too much" is, when "too much" film has accumulated undeveloped, I go into lab rat mode and whittle it down some. The "enough work" or "too much work" categorizations function as an inventory control system so that I always have some photo work available, but not an overwhelming mass of undeveloped or unprinted work piling up.
Not having any darkroom work awaiting me means that any dearth of shooting opportunities would bring me to a complete halt.