I recently sat down with a cop, a public defender, an assistant state’s attorney, an assistant attorney general and a judge to discuss negotiation and the use and nonuse of power. Their opinions were remarkably consistent.That’s because “they” is one guy — Associate Judge Daniel T. Gillespie, currently sitting in the Law Division’s Motion Section. He’s done virtually every job in the system and loved them all.“Every day was so good,” he said. “And it went so fast. …