I knew the warnings about clipless but still fell on my maiden voyage using them, at a fully populated 4-way stop, with my wife behind me grinning widely on her platforms. I laid there on my side, still attached to the pedals, for what felt like minutes trying to unclip. Now unclipping is just 2nd nature, and is something I do instinctively, even if I'm on platforms.

Riding clipless on very technical uphill mtb is a whole other next level skillset, and not for the weak of heart, since you sometimes have to unclip (or clip in) while continuing to pedal at full cadence and power, while only going 2 mph, and while maintaining your balance.