I think it has something to do with TNG being bound by the Roddenberry Box and not Voyager. Roddenberry had a strict edict not to have interpersonal conflict within the crew. Heck, even when Worf refused to save Crusher's patient's life they barely referenced it later except through one throwaway line. Without the interpersonal conflict, they couldn't have those bonding moments after the conflict was resolved.
Also over half the main cast was really, really introverted. The only extraverts in the cast were Riker, Troi, Crusher and O'Brien.
Introverts? Picard Data Worf Geordi Ro Barclay Pulaski Wesley. Roddenberry really liked quiet geniuses. Pretty much all the recurring characters except for O'Brien.