One thing that everyone forgets, the 2-4% change from VISA/MC/AMEX/DISC is passed to the consumer. If I shop, e.g. buy groceries, I've always found it cheaper at the places that won't except CC than the places that do except credit card. Therefore, by using a CC, you're almost always paying a 2-4% surcharge for that luxury (which adds up to roughly 100-200/year just on food alone.)
The same applies with a debit card then in respect to surcahrges.
Here in the US, the only places that I have ever seen charge more for using a CC/debit than cash are on the very random gas station (rare) or paying tuition
* At least in the US, your credit score is most definitely used for more than credit
Again, you may not like this at all (I certainly don't!) but the number of situations where your score is being checked is on the upswing. Applying for a job? There's a reasonable chance at some point in the process that your score may be pulled. My home and auto insurance just went down a substantial amount as they pulled my score and found it was quite good. The converse would have happened if my score would have been low. I could post more examples but I suspect everyone gets the idea.
Again, credit is a tool. Misuse it to your detriment or use it to your benefit, your choice. Yes, you can try to just not play the game but there are already disincentives for that approach and I suspect there will be more going forward.
Very good points. I remember having my credit checked when I got a job with the government. They figure if you have a poor score, then you are more opt to commit unethical/unlawful behavior to help ease finances. Regarding insurance, that is also true. You would be amazed when you get your credit report at what inquiries are made