Peeka aren't helpful?!? You must be a lower level. They are used in almost every TH9 and TH10 attack in our clan wars.
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To each his own, I guess.
I'm an early TH8, have a mid-TH8 clanmate that uses GiWiPe in war, as in, giants, wizards, pekkas. Level 5 giants, level 5 wizards, but only level 1 pekkas. He cleans up mid-TH8's pretty well, usually 2 stars bases I would never hit with a ground army, because I'd be lucky to get 1 star.
(Not that it's relevant, but I'd just 3-star a mid-TH8 with drag-loon instead. I have level 5 barch, but my giants, WB's, and wizards are still level 4, and I haven't even upgraded a barracks to level 10 yet. No reason to. Don't need pekkas. Yet. Maybe when I get golems and can start trying GoWiXX strategies.)