I think it is kind of a myth that clipless should not be for beginners....

In reality toe clips can be more difficult to use than a pair of double sided clipless pedals that are set fairly loose. For one you always have to flip the pedal over to get your foot in. Most newbies must look at the pedal while attempting this and when you are not looking forward you run the risk of crashing into something (like another rider.... someone doing just this had drifted to the wrong side of a trail around a corner and ended up hitting me head on....) As someone who is accustomed to clipping in from the spin bike, getting in really should not pose a problem for you.

Now then, getting out. If you have decent set of pedals and adjust them properly the act of pulling your foot out should not be physically difficult. Can you forget to, could you panic.... yeah sure, but then again you can forget about being in toe clips or power grips too. Again - you've already used clipless pedals, so the action of unclipping is not foreign to you.

If you do fall..... clipless pedals are made to release. They are like ski bindings. Toe clips, power straps etc don't have this feature.