The dot isn't that hard to pick up if your presentation is good. If it's not, yea, you'll fish for it. Pretty big tell-tale that you need to work on your presentation. Biggest tip I've learned in red dot focused classes is that, if you're grip is consistent, the dot will almost always be high (especially w/ Glocks) and all you have to do is apply more pressure with your support side pinky to bring it down into the the plane w/ your eye. Main thing is to dry fire and work to pick up the dot before your arm is completely pushed out into the firing position.
As for benefits, there are many. I'm now 42 but I've had bad eyes for years. Since I took my first force on force course I started carrying w/ XS Big Dots because they were so much easier to see. Now, the red dot does that. Secondly, it allows you to be target focused w/ both eyes open to see better and not have to worry about focusing on your front site. Third, accuracy at extended ranges is an order of magnitude easier. My friends and I start w/ shooting head shots at 50 as our warm up for any range session and they are rarely missed. Finally, if you're having to send rounds at someone at 7-10 yards, you are probably point shooting or, at most, back plating them. It is quite easy to make hits at 10 yards using just the back plate of your slide (this requires shooting w/ both eyes open). Some even put a white dot there to make this even easier. You're not going to be precise, but you can get effective hits on a man sized silhouette w/ a little practice.
Personally I believe RDS on pistols offer far more pros than cons.