I like colours. Like Cathyjc, I have lived in the tropics (South India) but I've always liked colour. But like Dovidola, I also consider browns, greens and so on to be colours; proper ones!
When we returned from India, we were in Warsaw for a while (because becauseness) and it was January. January in Poland can mean beautiful sunny but cold days with a crisp blue sky, or it can mean grey fog, clouds, mud. It will mean snow, which isn't white and clean unless it's just fallen. It might have been lying there since November, in which case it's grey or brown. But that's weather and we're talking about clothes; in Warsaw, they're all black and grey. And people's faces are so white! Which isn't just the contrast with Indian skin, it's a winter thing. And definitely people's moods are grey. In the countryside, strangely, people are more likely to dress in colours; not bright reds and yellows, but at least bright blues and greens. It might be because people are less fussed about clothes so don't search out the stylish slick black and grey, but also it's easier to be unconventional in the (Polish) countryside than the city. (I'm fairly familiar with Polish villages, cos I married a Polish peasant girl – her own self-description.) And Britain, with the probably exception of the urban-rural contrast, is very similar. Okay, the snow is another difference. I think a lot of it is down to the requirements and expectations of work dress codes and school uniforms.
But the question was meant to be about bright colours for safety. TBH, I've never thought about it. Although, as I said, I like bright colours, I don't like fluourescents, so I personally wouldn't wear those. I do like reflectives, but I wouldn't particularly consider them as a safety factor on the hills. So I reckon my answer is you like it, wear it, if you don't like it, don't let safety considerations persuade you otherwise.
There's also the question of what shows up where. Fluourescent yellow (apart from my dislike of it!) doesn't always show up that well against grass. Orange or bright blue can show up better. Or pink (a maligned colour).