I'm a highly selective dip and sipper, treating roughly half of my water. The new Sawyer filters are so light and easy its not even a big deal anymore, just plumb it inline with your hydration system. For family trips I use drops in large batches. But I do enjoy the freedom and wilderness feel of drinking cold fresh water from an obviously low risk source. Its liberating and perfect simplicity.
In heavily used areas like Whitney or any popular camp area I take the extra precaution, besides, the appeal isn't the same knowing hundreds or even thousands of people camped there a season. The greatest risk seems to come from cattle, so I assume they've mucked up all water downstream. That's just my personal risk/reward tradeoff level, but a lot of people can't get past the mentality of treating every drop like it's poison. Do some research and keep an open mind.
