When I first started using clipless it was finding the foot into the pedal that was the hard bit, I tried some single sided magnesium pedals and to be honest they were great for clearance (& light as buggery
) but when you need to get away quick nothing like as easy as double sided.
For sure when you get a bit more experienced with riding clipless then pulling away with only one side clipped in and one foot perched on the wrong side for a rev or two isn't so much a problem but the last thing you want as a returner(or any other time) is to have your foot slip off in the middle of traffic whence pulling away from the lights etc.
I don't know which Time cleats you use personally but spd type shoes with the recessed cleat are very easy to walk in and there's a massive choice too.
1958 Carlton Super Python
1990's Gitane VITUS GTI Triple Butted
1996 Raleigh Titanium Special Products Division
2007 Specialized Globe Pro
2007 Specialized Globe Expert Ultegra 6700
KTM Strada 6000 Carbon Dura Ace 9000