After I posted the above I realized that although the second diver without the basic knowledge might be safe, she is not safer. The diver might think "what does it matter how close I come to NDL as long as I don't get it down to zero. Once knowledge is gained she might think "if I keep my NDL greater than 10 minutes I will be safer than I would be diving to within a few minutes of zero.
To answer the OP's question, I don't think PDC's create any desire for divers to run down their NDL in comparison to using tables. Divers who like to push the limits would look at the tables and say "Give me that time in that black box". The PDC just makes it easier for them to do that. No setting a dive watch or starting a bottom timer and carrying a separate depth gauge.
I also suspect that table users have to think a bit more using them and the impression of new divers is that the computer knows all the variables and as long as the computer is on they are 100% safe. Yea I have a N2 gage but the one that counts is the NDL one and the tank pressure.