True enough for the Jill sections. What about the forced action parts with Chris / Parker / Quint & Keith though? Surely the game gives you enough ammo to compensate but I imagine those being the more difficult parts of the challenge.
Both parts you mentioned are pretty alright. They are not too hard.
The breaking points of Inferno mode are getting started (Ep1 Jill) and the Jack Norman boss.
Playing on NG+ definitely makes the mode way easier, but it's faily possible to complete it on NG without any OP weapons and upgrades.
For Chris' wolf section just make sure you save up enough herbs and decoys till you fall down and waiting for the AI.
As for Keith just use the ladders often to climb to different spots.
Between the 2 action areas, I would say Chris' wolf stage was harder.
(Completed Inferno mode on PC, but I don't think there's any major difference compared to 3DS)