Honestly I haven't found it that much of a pain, and I find it to be a bit smoother than the dosdude patchers (Not to minimize those; I still use and love his stuff on other machines!). I have it on a 2010 27" iMac, a 2010 white MacBook, and a 2009 mini and it's delightful to use. Certainly gives them a much longer lease on life!I love OCLP on my 2012 MBP and Air. I haven’t tried it on a non metal GPU in awhile. It seemed a pain with OTAs and the re patching compared to the metal gpu machines.
That said, it's smooth as butter on a native Metal machine - I use it on my 2013 27" iMac and I honestly can't tell the difference between this and a natively-supported machine.