If you are experiencing complete crashes with Creator 3.3 with the example programs and a Cypress Eval board, then it's something with your computer. I don't think Creator has ever crashed on me once. I have run it since the first version with PSoC3, 4, 5, BLE, PowerPSOC and various other specialty PSoC's, using the MiniProg1 and MiniProg3 as well as the eval kits with the built in programmers.
It has been rock solid. I also participate on the Cypress forums, and there just aren't widespread reports of crashing issues.
The PSoC chips have so much proprietary (and useful) programmable logic that it's useless trying to use alternative toolchains. The Cypress stuff is really good. Cypress as a company is really food. I'd recommend fixing whatever is wrong with your computer or your software install and giving the OEM stuff another shot.