I wasn't questioned when I went for the advance poll. Best voting experience ever, though. No crowds, no wait. Super easy and stress-free.
Consider yourself lucky, then. Some EC workers think they get to question you about all kinds of things before handing you the ballot.
In my case I do all my voting by in-home special ballot. I qualify for this, and it's the law that I be accommodated. The contrast between municipal, provincial, and federal is night and day.
Municipal - no problem.
Provincial - might take a bit of reminding, but it ultimately was problem-free.
But federal? Harper's little Reformacon minions were hard at work, doing their very best to make it as inconvenient as possible for the non-Conservatives to vote... meaning I checked and double-checked and triple-checked my place on the voter's list to make sure I wouldn't be among those receiving robocards directing me to nonexistent polling stations or mysteriously changing my name or address, as this had happened to others far more times than could possibly be accounted for by simple error.
When I phoned the Returning Officer to arrange for my in-home ballot I didn't expect the weeks-long runaround I got. I was asked a lot of impertinent questions, such as how did I get my mail, how did I do my shopping, how this-that-and-the-other, and was told that I'd have to get someone on the voter's list who would normally vote at my polling station to vouch for me that I actually am me and that I live where I live, even though I would also have to provide the same kinds of ID that anyone else would have to, and we would actually be doing this in my own living room surrounded by evidence that I'm me and I live there. It wasn't until weeks later that they told me I didn't actually have to do this; it must have been one hell of a speech the campaign worker gave her (I did get someone from my candidate's campaign team to advocate for me). Among other things, the Returning Officer tried to get away with "I'll send somebody over, IF I HAVE TIME."
Not good enough. It's the LAW that they had to accommodate me. And when I was making final arrangements, she had one last outrageous demand: It's the rule that anyone voting by special ballot has to provide a photocopy of whatever ID they're using, or the EC workers take pictures of it in the case of in-home ballots. This Reformacon Returning Officer wanted me to access my online banking and allow the Deputy Returning Officer and Poll Clerk team to look at my current bank statement.
No. Damn. Way. I told her there was no way I would ever allow that. I pointed out that I had already told her which forms of ID I had, and that all were on the approved list. Elections Canada has no need of my SIN, bank statement, credit card statement, tax return, or any other financial documents.
So if you avoided all that, congratulations. There were a lot of problems in the ridings with incumbent Reformacons, since that party would have hired their own to staff the polling stations. It's not the first time this sort of thing went on; back before my medical issues prevented me from working outside the home, I did work for Elections Canada in various capacities. The first interview was conducted by a 60-ish woman who was friendly, and at one point asked me point-blank if I was a member or supporter of the Reform/Canadian Alliance party. That's actually not a question that's even legal, let alone ethical. Her reaction when I didn't immediately say yes was an "Oops, I wasn't supposed to ask that, but as long as I did...?"
I tapdanced my way out of that by saying (truthfully) that I had known the incumbent for many years, as he had been my high school biology teacher in Grade 12. She beamed, taking it for granted that of course I would support my old teacher, and I got the job (should have had it anyway, given my previous experience in municipal elections; the basics are the same at all three levels of government).