Ezreal E+W Simple Trick

Look, I'm not an experienced Ezreal player, quite the opposite realtors. But, there's this thing I've only ever seen myself done and I was wondering if it is because it isn't all that useful, or the damage is better, or possibly people just don't know. What it is is that if you fire your W then quickly E in front of it, like friendly champions you can also gain your own attack speed boost. It's nice in little fights and stuff, and if you're close enough you can still land the W on your enemy, or you can use it to help you take down a structure or monster since it'll give you the extra attack speed from your passive, since hitting yourself counts, when you can't hit anything else AND the attack speed from the W ability. So I wanted to know, is this a useless trick, do people not know it, or have I just missed it when it is used? I'd like to know what you guys think, since I'm sorta new to Ezreal