> Has anybody here hiked Observation Point in Zion? I am scared to ask how Whitney's switchbacks compare... but if you are familiar with both... please do tell.

I have hiked Angels Landing, but not OP. OP trail starts about 4400' elevation, and climbs over 4 miles to 6500', for 2100' gain. Whitney's 99 switchbacks section starts at 12,000 and climbs to Trail Crest at 13,600. Crazy as it seems, the last 900' over the 2 miles to the summit often takes people longer. The higher elevation makes quite a difference.

Just hike steady, don't push yourself beyond moderate aerobic levels, and you will make it.