Having trained on single engined aircraft (FW and RW), flown them as an instructor and wrt helicopters, operationally, I have since flown twins for quite a long time.
I maintain the view that I'd rather have a well equipped single than a poorly equipped twin.
However, the argument for and against SE isn't just about the likelihood or not of engine failure. It's about duplication of other systems, such as electrical generators, especially with regard to IFR operations.
I have flown in IMC in both single engines fixed and rotary wing aircraft (trained to do so and done quite legally) but i do look back and think that I'm very glad not to have to do it now.