The IMCR showed me how to accurately fly height and heading.
Up until then, I thought I was a decent pilot at PPL level. I wasn't as good as I thought I was and the rating showed me that. It also improved my confidence in taking further my ability in handling an aircraft outside my comfort zone.
Whether you choose to fly in cloud or not, the rating will make you a better pilot and you will enjoy your new found competency and associated confidence.
On top of that, I have hand flown an approach from 30 odd track miles in heavy cloud (snow) down to the point of breaking out at absolute minimums at circa 2DME bang on the money at an airfield that can not accept noddy levels of performance. Hugely satisfying, but not to be repeated.
There is a downside to the training and it's called the NDB hold. The way the beacons are disappearing, there is hope that it will be consigned to the realms of history. To this day, I am still bewildered about gates.
Do it and enjoy it.