VOY and ENT are polar-opposites. A lot of VOY plots depended on advanced tech. ENT plots depended on none of that technology being in place yet or being super-primitive. In ENT, Earth is under Vulcan's thumb. On VOY, Voyager is under no one's thumb. VOY had to integrate two crews. ENT didn't have to do that. VOY was cut-off from the rest of the Quadrant, ENT wasn't. Janeway has charisma. Archer has whatever it is he has. Torres is definitely not Trip. Chakotay is definitely not T'Pol. Seven is an ex-drone who has to rediscover humanity and constantly butts heads with Janeway in a pseudo mother/daughter relationship. T'Pol represents Vulcan and Archer represents Earth. The dynamics are reversed. Earth is the child, Vulcan is the parent. VOY doesn't have ridiculous decontamination scenes and none of the characters on VOY remind me of Bush.
They're not the same show. Anyone who says so is being superficial. They were produced by the same production team. They aired on UPN. That's where the similarities stop.
Most important, I can actually sit through VOY. I still, to this day, cannot get into ENT for the life of me.