I use courgette noodles a lot in stir fry. I make them with a 'spiralizer' gadget that is intended to make spiral cut carrots etc for salads - they tend to come out in summer from advertising firms like JML etc. I bought mine in a charity shop for £2 having heard that they made good 'noodles' and despite the knocking I get from my husband about my kitchen gadgets, I wouldn't part with it for anything. The way it works is that you put a slicing or a grating blade in and then the carrot or courgette or whatever gets turned and fed onto the blades to form wither a long spiral slice or long spiralled strands from the grater, which are ideal for noodles. You don't pre-cook the courgette noodles; just put them raw into the stir fry and cook for a few minutes until they soften. Honestly, I don't believe anyone would guess they weren't ordinary noodles once cooked in sauce etc.
Mine looks very similar to this one on amazon. co. uk - the 'Lurch Spirali' but I notice they also do a vertical one which might be easier to operate without it skidding off the counter!