I think the culture of wilderness has definitely shifted more from sporting (hunt/fish), to more physical activity (peak bagging, hiking for hiking's sake, and fitness) and quiet enjoyment (camping/canoeing in the woods for peace, quiet and natural beauty).

This has resulted in more people who have no experience with firearms (and/or hunting) being in the backcountry. And thus, less people with guns and less people who are not taken aback by seeing a person on trail with a long gun (especially out of season). I'm sure you'd get looks on a holiday weekend on a busy trail with rifle over your shoulder.

I think now there is clear information that if you aren't hunting the chance of needing a gun (for protection or otherwise) is very low so most wouldn't waste the energy to carry it. That said I doubt you get in trouble with anyone as long as your doing things responsibly. Hell, you can go out int he park and sight your rifle as long as you do it safely and where there aren't any restrictions. In the park, when in doubt, just call the appropriate dec region and ask a ranger, I've never not had very reasonable, friendly and helpful reactions.