Was not the accuracy of the DSO's plotted in the 2nd ed of Uranometria improved considerably? As I remember it the 1st ed has a long list of errata.
I spend about 50% of my time under the stars imaging, and have found the Field Guide to be very valuable for finding "the next target". Once one is familiar with the field of view covered by scope/CCD and the expected performance on various types of objects, it is relatively easy to scan the listing for the chart you are currently imaging on for a target that would "work" with your imaging set up. For that matter, the Field Guide also works well for visual observing as long as you are not star hopping - at least when doing my usual: working in the same constellation-sized patch of sky for 1 to 3 hour periods, rather than chasing all over the sky (really helps with not having to move my ladder around a lot).