The following is not an advice, it's just my opinions.
rrsp is good (intended?) for deferring taxes, ie, you pay the taxes when you are in a lower bracket, for example, in retirement. I am sure you knew this already.
Bear in mind when you withdraw, the money will be treated as earned income and taxed at your marginal rate, as opposed to capital gains and dividends from a non-sheltered account.
While you don't "have" to draw out a whole bunch of money at once from the rrsp, once you live past 71 the mandatory rrif withdrawal will be enforced and you could wind up paying more than you had originally thought.
Most people will benefit from having a rrsp, but I believe it's really a case-by-case kind of thing. If your passive income (cap gain & divi) exceeds 70k after you retire then having a rrsp might actually make you pay more taxes in the long run, but again, it depends.
If you choose to start a rrsp, it might be beneficial to withdraw from it as soon as you retire, not much, but just below the individual exemption amount every year.
we are currently withdrawing 5-10k every year from our low 6 digit rrsp, because if we leave it untouched, and if we live to 71, we will be surrendering many many k ( >100K) to the cra.
These are not advices, just my opinions.