The amount of traffic on the road has increased incredibly in the last 20 years, but the number of dickhead drivers has gone through the roof.
Drivers WILL NOT see you on a motorbike.
Sorry, but that's hysterical BS. In the 16 years I've been riding I think the roads are better for bikers, not worse, for a start. I have very, very few problems on the bike or scooter. I did 1200 miles in 2 weeks recently to Aylesbury and back for my Cytech course and it was fine, no stress at all.
But there's a key to it, and that's TRAINING. to be hones I never think weather a driver has seen me or not. I just don't put myself in a position where that could become an issue. It's fairly easy to make decent, smooth progress through the traffic in complete safety.
The last time I had to brake hard was about 1/2 hr ago....... I practiced an emergency stop from about 40mph on our road, just to make sure I knew what it felt like. :). ( stuff me you can stop RAPIDLY if you trust the ABS!!!)
To the OP: do it. Do it now. It'll only ever get harder to get a license (I wish it would for a car license too...) and you'll most likely love it. I think your intended bike looks pretty much spot on for someone tall, that'll be fine as long as you don't do too much motorway work, and reasonably crash proof too.
Oh yeah, you will crash. Everyone does. I've had 3 or 4, nothing too hectic, I just get back on and ride off mostly. Accept that and you'll be fine.
Training is good. IAM or ROSPA do some good training, get into it, they'll teach you more and make you a better, safer rider.
Good gear is worth it, but I worked up to what I have slowly. I'll be wearing well over £1000 worth of kit, and I'll be warm and snug literally right down to freezing point for 50 miles or more. There's some good budget kit around though. Go for textile jacket and trousers, they are far more versatile, and you don't need to pull over to put on waterproofs when it rains. Which it does.
Also, learn about your bike. Cars can be generally ignored between services but bikes are more fickle, just like mountain bikes are really. Tyre pressures make a massive difference, you'll probably need to learn how to adjust and lube the chain, keep an eye of the oil and the brake pads...... Stuff like that.