Longtime aldehyde lover here, though it took me years to come to terms with No. 5. Long story short: you do not have to give up on aldehydic notes. Most scents contain some sort of aldehyde; it's the aliphatic straight chain C10-C12 that defines aldehydic fragrances. That is what you smell in No. 5. However, not all aldehydics smell like No. 5! And Mitsouko is a great example of a scent that contains aldehydes (namely C14, which provides the peach note) but is NOT an aldehydic.
You may just not love this category of fragrance but do not give up based on No. 5. Two more aldehydics for men (or the gals, both are very unisex) to try: Etat Libre d'Orange Sex Pistols and Knize Two, which also happens to be one of my favorite masculines overall. Good luck on your aldehyde exploration! Fantastic suggestions so far and I'm sure there'll be lots more!
P-pie, try the Chanel #5 Eau Premiere, as everything is toned down. Everything. And it is totally unisex in my opinion.
Also, great suggestions above, La Myrrhe is a bomb, but yet hides it under other interesting, and very good, stuff.
I don't really love aldehydes, but have come to love many Chanels. Also try Bois des Iles, for many reasons, but also to get the aldehydes as a component, and not the pure smell. Let it sit for an hour, and let the beauty of the middle notes start to sink in. You will appreciate the balance, and why they are there. It is a journey for sure.