To answer OP, overall NV does not Railroad you. However i still wish for some diversity in rummaging through New Vegas. Instead of A. Southern Road (easy), B. Mountain (moderate), C. Junction (hard). Add little twist and turns to travel through the Mojave (towards NV at least) just to spice up the geography a bit.
Sure Fallout 3 had full open world, but the geography of the landscape was shit. It was practically a flatland with the Locations (you know point of interests), having some workable landscapes. Sure it differentiates (from the flatland) and makes them more notable but leaves the general map bland as a result. Also the world felt dead compared to NV. While that may be part of the intent (given the atmosphere of the game) it didnt help that my walks to point A (POI) to point B (another POI) were tedious. Part of exploration is to find interesting things so why not spice up the trip as well as the destination. Yes there was Random Events in 3 but they felt so mechanical in nature and wasn't as executed seamlessly IMO. It works yeah, but i always get this forced feeling from them rather than the intended ones. Maybe its cause im always the central focus of them (like the whole game in general).
If it wasn't obvious before i like traversing New Vegas more than the Capitol Wasteland primarily for the fact i might meet somebody interesting. Its jarring to keep hearing people say FO3 locales were more interesting than NV, i feel like we're playing two different games now (yeah yeah personal opinions, etc). While New Vegas had more completely pointless/wasted potential locales than FO3 (IIRC haven't touched 3 for years) i feel that the ones that did stand out (only ones people talk about) were better compared to FO3 counterparts.
To end on a final note, its somewhat unfair to judge both NV and FO3 locales on their importance towards the player. Since in FO3 surviving was a prominent theme so any locale was good off the sheer chance of loot. The themes in NV were different (less surviving more rebuilding) so these same locales held less value compared to FO3.