I work in the industry so can definitely shed some information on this.
Bedbugs have been a massive problem for a while now (we are talking 4 or 5 years) - and not just over the last year or so. Many Toronto hotels have been sweeping their bedbug problems under the carpet and won't admit they ever have bedbug issues. I know of one of the most famous Toronto hotels (probably the most famous, but obviously I can't say the name) throwing out all the furniture from one suite as they couldn't stop the bedbug problems.
Bedbugs aren't picky to where they stay, they cling on to your luggage and go with you to your next hotel, or your private house or residence. I would say nearly every hotel in Toronto, irrespective of star rating or qulity, has had bedbugs at one point in time over the last few years.
Over the last year the City of Toronto has taken more notice of bedbugs as they started to be a real big problem in the city's social housing shelters and hostels. However, bedbugs are NOT viewed as a health problem. They are a nuisance, but they don't carry deseases, so public health are NOT interested in helping with bedbug problems.
If you work in hotels, or stay in hotels often, personally I wouldn't worry about bedbugs. Bedbugs are now part of the hospitality territory - if you are THAT worried about getting them, never stay in a hotel. It's as simple as that. However...most of us do want to travel and stay in hotels, so really, just don't think about it, you will only end up being totally paranoid. I would say that every hotel in Toronto has maybe one room with bedbugs at any point in time. Really the chances of you being in that one room is fairly slim....but there is always a chance you will check into that one room, of course!
If you want to be careful, always check behind your headboard when you check into a hotel room, as you will often see bedbugs there first. Generally they only come out at night so normally you shouldn't be worried during daylight hours.
Lastly....I know of one movie theatre in Toronto that got bedbugs...so its not just confined to hotel rooms. Don't be worried or paranoid about getting bedbugs. ANYbody who travels puts themselves at risk from getting them, and its not worth stressing out in my opinion. (mind you, if you are that unlucky SOB that does pick them up in a hotel room, THEN its worth worrying about!).