The huge swarm of attackers concept is as I understand it being re-used in the recent WordPress attacks. We should be prepared for swarm attacks on other applications as soon as they reach a critical mass of users.
There may not be a bullseye on your back yet (but have you looked lately?), but you are an attractive target.
Fortunately, sane system administration practices will go a long way towards thwarting intrusion attempts, as in
keep your system up to date,
allow only what's necessary for the task at hand and
keep watching your logs for weirdness.