Which instrument rating do we talk, national UK-IMC or Part.FCL EIR/CBIR? I was a long time supporter of the UK-IMC until I recently met the first students finishing EIR on the CBIR route. I have to admit, EASA did a pretty good job on it and the UK-IMC may be obsolete now.
And yes, IFR training will make every pilot more aware on how to perform procedures and fly more precisely.
Two thing to keep in mind, first, you need to have frequent access to an IFR equipped aircraft and second, you have to fly frequent IFR to keep your skills current and actual. Do not underestimate these two requirements, as an IR will also be a bigger license to kill yourself.