My experience was completely different. In FO3, I never had to eat or drink anything because taking a nap for an hour would completely heal you (including crippled limbs). By the time I stopped playing, I had about 1000 Stimpacks and hundreds of rounds of ammo for every weapon. You couldn't walk five feet in FO3 without tripping over a medkit, ammo container or bed. Supermutants and deathclaws were also very underpowered and posed little to no threat.
When you played New Vegas in Hardcore mode, sleeping wouldn't heal anything and crippled limbs could only be healed with Hydra or Doctor's Bags. Definitely made the game harder than FO3. Unfortunately, chems, ammo, food and caps were everywhere, just like in FO3.
Overall, I liked NV more than FO3. It was more challenging, had much better writing, much more open-ended quests and was generally more faithful to the first two games. FO3 had better dungeons but that's about it.