Adding to what BenMitchell said, you know what's funny...?
In GTA V, I always have this strange urge to enter places that aren't enterable. Like all the closed stores, restaurants and houses. But I don't really have the same nagging in IV, Watch Dogs, Sleeping Dogs or LA Noire. Why is that? I can't figure it out.
It's not the lack of interiors, because the other games don't have that many and V still has clothing stores, ammu nations and gas stations so I don't think that makes that much of a difference. It's not the advanced graphics or authenticity because LA Noire is the best in that regard and both are set in the shiny LA so they should feel similar. And yet, when I drive in Mirror Park in LS I'd like to enter and explore the houses there, while in the LA Noire variant, not so much.
So what could it be? Any armchair psychologist around here?
One theory I have is that since LS feels more like a playground or a dollhouse, I'm trying to approach it as such and would prefer to have everything open to me. While if the city feels more 'real', then I also behave more real - I mean, I wouldn't enter a store if I don't want to buy anything (I'm a man dammit) and wouldn't need to enter other people's houses just for the hell of it. But I'm not sure if this theory holds, because it can easily be interpreted the other way around (i.e. you'd rather enter real places, not the toy ones). So it could be something else yet.
BTW Watch Dogs did a funny thing in that a lot of the businesses are obviously closed, some with barred windows and such. I think that was a pretty smart way to distinguish non-interactive things. These other games don't do that to the same extent.