Totally agree, kokyu-nage is your friend in free-form, but the more "complicated" forms have their place in free-form as well. Not only are they fun to try and do if the opportunity presents, but if you muck-up your "simple" move (common problem for me) you're often still in a position to use sankyo etc (like when you're left only holding the hand/arm when you were going for the torso..).
The more options you know, the more likely you are to be able to adapt to a changing situation. Also, I assume you're talking about using the "classical" forms of these moves, try using the neck/shoulders as your lever instead for ikkyo, much more fun. This leaves the aside the benefits the other moves on learning how to manipulate your partner with minimal purchase.
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