I guess. My company (and I believe most) highly incentivize it by offering matching funds. The company says, "want to save $1000 of your paycheck? We'll throw in $500". The general wisdom is, you'd be an idiot to leave money like that going unreclaimed.
Where I am there's actually a %-age of your salary/wage that's "returned" to you when you retire. You don't get a choice.
You can choose to contribute to an employer-match scheme (I do) or even fund your own pension account with monthly payments to a pension provider. But these are in addition to the above forced pension.